Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a1df0dcccfbf2b…

MALICIOUS

PDF

38.7 KB Created: 2020-08-13 05:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bf6719eb5b5ce263951400ddc4ce221 SHA-1: cb49a51e372784152368259ae545b9a59ed91eb9 SHA-256: 12a1df0dcccfbf2be1c62a681375b6f7c8a53bc964dfb1eb5496241f80135dd9
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign Shopify domains, but also includes a critical link to a known malicious redirector. This suggests a link farm technique used to disguise malicious activity, likely aiming to redirect users to phishing or malware sites. The document body, though heavily obfuscated, contains text related to English vocabulary and PDF, which is likely a lure.

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.ru/pify?keyword=j%25C4%2599zyk+angielski+s%25C5%2582ownictwo+tematyczny+zbi%25C3%25B3r+%25C4%2587wicze%25C5%2584+pdf
    • http://zapizejop.mathiasscarborough.com/uploads/1/3/2/6/132695829/zajefilo.pdf
    • http://zuwapo.resilienttruths.org/uploads/1/3/1/4/131408999/baralob-xigazabe-dipipil.pdf
    • http://files.jassiewassy.com/uploads/1/3/1/6/131606260/c0c36ad.pdf
    • http://files.evansadopt.com/uploads/1/3/1/4/131408439/793d9be0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1222/6206/files/3gp_to_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0433/8280/0542/files/kinuxorelabixen.pdf
    • https://cdn.shopify.com/s/files/1/0437/0405/8010/files/online_document_converter_to_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0432/0254/3778/files/los_tres_mosqueteros_alejandro_dumas.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1085/files/49733153734.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/briggs_and_stratton_model_number.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9680354999.pdf
    • https://cdn.shopify.com/s/files/1/0429/8548/8543/files/16880853996.pdf
    • https://cdn.shopify.com/s/files/1/0439/6512/0670/files/genetica_libro.pdf
    • https://cdn.shopify.com/s/files/1/0432/4284/8418/files/jumuganolasafega.pdf
    • https://cdn.shopify.com/s/files/1/0428/0123/4076/files/wugexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3010/1668/files/gavoliziwuzexoluxawav.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/14102136302.pdf
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/16876974159.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_off000050c9.bin
656071aad3a9f11a050ecce3917849482565a8d14b60f4fc5cdab2d8f42509ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50C9 6552 bytes
font_01_sfnt_off0000660e.bin
9e9366452491c9f0f5583a13d7c5feb0022113fdd59ffbf3e03aeab48d76c902		 pdf-font-stream PDF embedded font (sfnt) at offset 0x660E 11944 bytes

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