Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a481ea85c44bcf…

MALICIOUS

PDF

43.7 KB Created: 2020-10-10 14:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 532f99574332b57b1cb11d3fac1f2c45 SHA-1: 10d978acb0e73f3cdb6f6fa820b803ace64fd7bd SHA-256: 43a481ea85c44bcf9183d494ea6ef5ecbcfdb1d87617a15244416ba688b87d1f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ggtraff.ru/pify?keyword=ukulele+bass+strings In PDF document text
    • http://files.redacrekennels.com/uploads/1/3/2/6/132682802/5406129.pdfIn PDF document text
    • http://vemef.soapurebathnbody.com/uploads/1/3/0/7/130775440/c5782.pdfIn PDF document text
    • http://kadodevi.adelantechc.org/uploads/1/3/2/6/132682878/siwiruba-lebuduj-bunibuzowiwo-vofuxa.pdfIn PDF document text
    • http://files.met-track.com/uploads/1/3/0/7/130739154/venakupovev.pdfIn PDF document text
    • http://files.newvisionyouth.org/uploads/1/3/1/4/131453624/boguva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1260/4582/files/fivos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/4506/5382/files/94550815069.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7397/8011/files/72488397382.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2471/9256/files/discovering_french_nouveau_bleu_unite_4_lecon_10_workbook_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9703/4393/files/pantheon_of_hallownest.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5646/3001/files/lux_tx9000ts_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5397/2630/files/rehoboth_beach_parking_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2363/7917/files/16445835129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa98e42-e264-4575-844a-937e3dff7ab9/41528862458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdcb7ad1-fbbf-4ad3-913a-bb5977a73aaf/sakukurirabilom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5845cfd9-4456-4655-ba2d-31b07386ebfb/29113629325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e64021cb-c8b4-493b-8c00-eb5b59734ee6/24442222244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be64076-3cb8-4995-9491-7427b35d1bbf/35697581256.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6365 5048 bytes
SHA-256: 107bd85a5255407af5f99316c1174faac7a681941004c8951aef0f77a5997224
font_01_sfnt_off00007496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7496 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00007d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D23 10648 bytes
SHA-256: 620b640f348f92e1ea43138aaa274cdec9ea99d8db0b287efc6eacb4b3a49fd9

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