Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e401fe9063e1c72…

MALICIOUS

PDF

35.5 KB Created: 2020-08-18 14:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab08f65f49e84d6fb8cdca357c028259 SHA-1: e28f0824a40aad06909e9cc5c5dd26eaa4799b72 SHA-256: 6e401fe9063e1c72e057b134088ed38ece4c3611398f1820e7f53253ebd83445
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector URL, which is a common tactic for distributing malware or leading users to phishing sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this behavior. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, suggesting an attempt to manipulate search engine results or distribute content through a network of sites. The ML classifier also strongly indicates maliciousness.

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=anbae+per+anbae+video+song++masstamilan
    • http://files.reflexinstitute.ca/uploads/1/3/2/7/132741293/pakodosabe_majine_xirosititija.pdf
    • http://files.cryptidclothing.co.uk/uploads/1/3/1/4/131407944/f49b521db.pdf
    • http://zipoda.theparentcompass.com/uploads/1/3/1/3/131381006/e4a179a5d75fa88.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4474/1015/files/accountant_cv.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/25688103469.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/70304261631.pdf
    • https://cdn.shopify.com/s/files/1/0432/7591/1321/files/27554474111.pdf
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/nesererot.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/nchsaa_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0452/1289/3344/files/34501154973.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/josuwor.pdf
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/online_urdu_islamic_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/zoneratikuguwuwijuxenid.pdf
    • https://cdn.shopify.com/s/files/1/0431/2855/3634/files/cengage_coordinate_geometry_book.pdf
    • https://cdn.shopify.com/s/files/1/0449/9764/0360/files/62945141193.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_off00004d3d.bin
aec2f3893b725845ff97febe7264ebe6e13ddcef750f962eb1c4b468774b791b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D3D 5468 bytes
font_01_sfnt_off00005fb9.bin
5a58443bec0999c51c85200858032dcd3eda417c41e0d1550a8a58323e7587af
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB9 9800 bytes