Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a553ae3799acf4…

MALICIOUS

PDF

42.4 KB Created: 2020-08-20 01:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a6f85e75608ee63fbaa4590e855d93f SHA-1: f35550f87f2a0530926276094ab25e9d07b44775 SHA-256: 08a553ae3799acf4105baedc9504d64bcbc18ceb827990352721ec1edebdf46a
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.com/pify?keyword=advanced+english+conversation+audio+free`. It also exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many of which are hosted on Shopify but some point to unknown domains. The ML classifier strongly indicates maliciousness, and the document body, though heavily obfuscated, contains the same lure text and URLs found in the heuristics, suggesting an attempt to drive traffic to malicious sites.

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.com/pify?keyword=advanced+english+conversation+audio+free
    • http://girog.gcemergency.com/uploads/1/3/1/4/131482853/murejo_veluba.pdf
    • http://files.lieberconsulting.com/uploads/1/3/0/9/130969476/numizukanefifi_tawuke_barisawapusa_kubiwedo.pdf
    • http://wogobikon.elizabethsingerhunt.com/uploads/1/3/2/7/132740718/3423153.pdf
    • http://gipupo.zenbock.com/uploads/1/3/0/7/130775373/fokibozufejadowozoge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6856/9238/files/tagob.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/faxagefikobowu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/najirafojuvok.pdf
    • https://cdn.shopify.com/s/files/1/0431/6296/0023/files/65837254165.pdf
    • https://cdn.shopify.com/s/files/1/0428/3590/2631/files/lixuvemixapanamod.pdf
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/dozejukujo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6616/files/analytic_geometry_family_of_circles.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/kudebalaxegedutem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7780/files/aerobic_biodegradation.pdf
    • https://cdn.shopify.com/s/files/1/0436/7892/4953/files/70783676064.pdf
    • https://cdn.shopify.com/s/files/1/0431/4074/3329/files/review_of_medical_embryology.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/16563895487.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_off00006788.bin
d1deb03f3e43d8627a46a9c26264151c1058e002adcc371ea6f5c1bc78c1c75b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6788 5332 bytes
font_01_sfnt_off000079ab.bin
17bcf466f0eca3520ebf28503eb1087c2998b0cdf3ba6357a914504bebfff701		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79AB 10288 bytes

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