Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4ca744bb54c879…

MALICIOUS

PDF

57.8 KB Created: 2020-10-29 10:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f5f1398dc5d6cff6e14b486ab9f59dc6 SHA-1: df0891ef07aec5789bd04b514396047c449e6f24 SHA-256: df4ca744bb54c87934a8e60b9ce12c0b1be481c2d6992fc0228693a832b14774
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body contains obfuscated text and the primary malicious URL, suggesting an attempt to lure users to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=simply+spray+fabric+paint In PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/judif.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/buvukujixasinaloke.pdfIn PDF document text
    • https://fewaxozane.weebly.com/uploads/1/3/4/3/134341296/norolerapab_rakasifebaz_nidusunolubali.pdfIn PDF document text
    • https://tijujuvuxerupuz.weebly.com/uploads/1/3/4/2/134236121/3952134.pdfIn PDF document text
    • https://jixobufasov.weebly.com/uploads/1/3/4/3/134324480/wosawuxotexuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/mavobumanedere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb4d74b7-8f54-44da-bd7f-defae594581d/83243518200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6e4439-0042-4cf5-a3c7-d1eab8e613de/fesetanesujutumawozuxana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/6384/1446/files/beauty_and_the_beast_doll_set.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7891/6530/files/western_union_receive_money_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5248/9662/files/84111075692.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6626/1141/files/pf_name_change_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rotafasaniz/indian_customs_broker_exam_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/nazatafifizunolezofewo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2647/8768/files/artistry_supreme_lx.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/59383027956.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5689/6927/files/41689556604.pdfIn PDF document text
    • https://s3.amazonaws.com/kepevipawit/cuaderno_de_gramatica_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7678d2e-0709-4e9a-babe-e235f9c9f3ce/listado_de_citas_asignadas.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/vonodejeju.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/sumuvebitapasawira.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6085/0599/files/handbook_of_pharmaceutical_excipients_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1764/9821/files/mimerowanabomegamanetogor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe68fa9-f087-42dc-951c-2f1a3568bd44/.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/20944825595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54495954-cc75-4789-940a-401672a55ea1/rudiranomudagob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6658/0382/files/bifopixomopafeliravaleta.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000b000.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB000 17844 bytes
SHA-256: 7ea83d1bcca513faae85a9c73d0e9377568822677888b1a0fcc8a5d20d01ea24
font_00_sfnt_off00007ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC3 5068 bytes
SHA-256: ce0df0b746c0a76bdaca7d95edbaf90eaf5fcf0946adc4b1c0c0f713589cf042
font_01_sfnt_off00008bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD3 10568 bytes
SHA-256: fa986b2f371d514bc38e0e369d6ebea4acde4c5eb98bf77d8fdb6bcebb4b064b
font_03_sfnt_off0000cb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB01 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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