Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c987acf8358ba76…

MALICIOUS

PDF

44.1 KB Created: 2020-08-09 18:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a7aedb4732003dda0f29a39fd6d2d888 SHA-1: fc3266630db54a60222aa6323c61b34ca0afc144 SHA-256: 4c987acf8358ba760207f9aaed39cefcbfcbff11c8c3ca7a2a803ad05973893d
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at https://ttraff.ru/pify. The document body, though partially corrupted, also contains references to 'Google traduction anglais francais pdf', suggesting a lure to trick users into clicking malicious links. The ML classifier strongly indicates maliciousness, and the presence of many external PDF links points towards a link farm or content aggregation strategy, often used for SEO poisoning or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.ru/pify?keyword=google+traduction+anglais+fran%25C3%25A7ais+pdf In PDF document text
    • http://lojalu.masksandmoreus.com/uploads/1/3/0/9/130969300/bc7aa33.pdfIn PDF document text
    • http://files.avinumalkeinumessianicsynagogue.com/uploads/1/3/1/3/131397971/pekurigakosed_zorokifi_givufovazine_begululuba.pdfIn PDF document text
    • http://files.blu-sail.com/uploads/1/3/0/8/130814535/72ab2e.pdfIn PDF document text
    • http://zijesun.veniceinyourpocket.com/uploads/1/3/1/4/131437532/jided.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/1/0428/9835/8432/files/97253363073.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/pinkprint_album_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9610/4341/files/92069639715.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3431/9776/files/21965169532.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zokiwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1653/4685/files/57272432132.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9517/8902/files/18701213829.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5426/0643/files/sql_server_analytic_functions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/gajiwitofozoreza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6245/0586/files/fitokutur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4839/3112/files/vukagajunizitewom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7529/7689/files/87161775791.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69A6 5536 bytes
SHA-256: c4d07ed1c7951a02d4f98769eb5ef9a0062427f38c8a036efe80ca3bddbe527f
font_01_sfnt_off00007c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4D 11780 bytes
SHA-256: 08e4e983ca0b457a11d28bfaa8ffa2284e9b84d62099a48943d1c345b7bb7d4d

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