Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f6c3533f99b649…

MALICIOUS

PDF

52.6 KB Created: 2020-08-31 14:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4946f07bde5bed6ab313a57f301f4ebc SHA-1: 9be2b25c657f56f70a20c8a373f71e33f306f9d2 SHA-256: 09f6c3533f99b649b4d895ac8e436f776e5aba5012cfa147547389bf90dd117a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests a link farm or phishing lure designed to redirect users to malicious content.

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=self+forming+base+quiche
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/8533/8526/files/golden_sun_djinn_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/4346/3074/files/implementation_intentions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4840/files/19209382076.pdf
    • https://cdn.shopify.com/s/files/1/0430/1514/3587/files/87191130422.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8913/files/77577051371.pdf
    • https://cdn.shopify.com/s/files/1/0437/0975/9641/files/understanding_the_discriminant_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/3302/5960/files/cameroon_crisis.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_d3df84ddff3b4417a849aea3b0451902.pdf
    • https://static.usrfiles.com/ugd/769f78_bafc61f518a44664877349d39372d08d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8ee6b17fb5641bd94b5b5786a7b4a0e.pdf
    • https://static.usrfiles.com/ugd/0a0016_4d51c3a8b71b49cbaae6a5ebd770655b.pdf
    • https://static.usrfiles.com/ugd/b8c837_ead31749629042c5bea6a0dfa8203bb5.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c88.bin
90c709acc213dda57107cea7f1a1284dbbc6b736dd6bbb0fa41f7602f68bbad0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C88 5464 bytes
font_01_sfnt_off00007ee1.bin
927b82924fb3b228515d7f3de1684a94a0711c7d3cc6f9db54ff83fe16ea3bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE1 10192 bytes
font_02_sfnt_off0000a1e1.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1E1 16312 bytes
font_03_sfnt_off0000b76c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB76C 4324 bytes

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