Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dd3d2195b7a8c0…

MALICIOUS

PDF

40.1 KB Created: 2020-08-26 17:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bbe98690f8e95e631e309dc39335708 SHA-1: 49619924521cab25aa2339f0579b434b23b1ca24 SHA-256: 84dd3d2195b7a8c02afb9e210cc16684627c78f345eb67bafd7de8ab8963a34d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=ejercicios+de+suma+y+resta+para+imprimir, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'ejercicios de suma y resta para imprimir' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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://ttraff.cc/pify?keyword=ejercicios+de+suma+y+resta+para+imprimir
    • http://files.dogsfoodandbooze.com/uploads/1/3/0/7/130775897/rizerezalapalot.pdf
    • http://files.ducksnestdecoys.com/uploads/1/3/0/7/130775025/jiviwivapebe.pdf
    • http://nulabexab.westernanimalresources.org/uploads/1/3/2/6/132696063/patoxiwowu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1308/6106/files/botany_honours_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/1523/2923/files/50727009348.pdf
    • https://cdn.shopify.com/s/files/1/0438/4129/0402/files/lojaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/donkey_kong_country_2_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0434/5420/2018/files/difosikosuvozipaniv.pdf
    • https://cdn.shopify.com/s/files/1/0433/9754/6149/files/kuzutiboluri.pdf
    • https://cdn.shopify.com/s/files/1/0428/5336/7975/files/85927200848.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/bbg_2._0_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/0008/5160/files/8769497521.pdf
    • https://cdn.shopify.com/s/files/1/0428/0667/3575/files/pumuporutibikegasusezote.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2255/files/edema_pulmonar_en_perros.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/rem_vs_em.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ba4.bin
d6cf27623186b5d26435525e8512becb2e213b80d3486958928cd96091d447e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA4 5320 bytes
font_01_sfnt_off00006dab.bin
40f28dbc05f5e5f1c9ee4eb4a829befecff71fb4763a8ec00a0e920f754e82a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAB 11056 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.