Malicious PDF — malware analysis report

Static analysis result for SHA-256 1951dc7181e528c0…

MALICIOUS

PDF

55.3 KB Created: 2020-08-10 14:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ece105549fd356b49af24c09b192dee SHA-1: 67f5ac070e9e7e29e5d7794cab68a3259f0f7bbb SHA-256: 1951dc7181e528c007e4d233f0c0947e7a64f1548c61495146ce386a9a8ba845
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical finding is a link to `https://ttraff.cc/pify?keyword=multi+attribute+utility+theory+pdf`, which redirects to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body itself is largely unreadable binary data, but the presence of the malicious redirector URL and the link farm heuristic strongly indicate a malicious intent to drive traffic to harmful sites.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=multi+attribute+utility+theory+pdf
    • http://files.bellavistadreams.com/uploads/1/3/1/6/131636644/b8d0f0252080537.pdf
    • http://wurox.mwdcoach.com/uploads/1/3/0/7/130775162/5255b4260.pdf
    • http://files.bluegreenandredconstruction.com/uploads/1/3/1/4/131454916/7ea00f6a2.pdf
    • http://files.studioambiguous.com/uploads/1/3/1/3/131382274/voriganezudeku.pdf
    • http://files.potterosaproperties.com/uploads/1/3/2/6/132696304/zisisofob_sisazodidateg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/60726710385.pdf
    • https://cdn.shopify.com/s/files/1/0434/3437/7372/files/lesson_plan_in_english_literature.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/65126393787.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/business_benefits_of_cloud_computing.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6000/files/proxy_site_com.pdf
    • https://cdn.shopify.com/s/files/1/0432/8846/1478/files/accounting_in_tally.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/figemetuvawo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5653/6479/files/convert_to_editable_word_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0437/6798/8376/files/30363518630.pdf
    • https://cdn.shopify.com/s/files/1/0436/9409/6539/files/the_adventures_of_tom_sawyer_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/4324/8533/files/2006_jeep_liberty_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007554.bin
f3daf21666e4b49ba21d2eda7ca9b6c5b20041ac7177e6e40485e133a1686d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7554 5196 bytes
font_01_sfnt_off0000870b.bin
f20e33295b578f6f03c85b8052f3ccd6fbaebd4ccfba6e529645ed2dfb756797		 pdf-font-stream PDF embedded font (sfnt) at offset 0x870B 16404 bytes
font_02_sfnt_off0000ba5a.bin
c686324b5df50fe48128460f0dbc89142d33ec892d66cbc153f9ac9b2e8c6047		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5A 16280 bytes

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