Malicious PDF — malware analysis report

Static analysis result for SHA-256 1923bbb1b26eaf62…

MALICIOUS

PDF

45.0 KB Created: 2020-09-03 02:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06872bdf03d0e8a75e0c15e73ed255f3 SHA-1: 68233abfb1808dfb0b591e5f8b1233a3856484ea SHA-256: 1923bbb1b26eaf62b1c15465181a7341f016d34c18e5adfaa9e524881ebca948
174 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.link/pify?keyword=confirming+interview+email+template`. This link is presented within the document body, suggesting an attempt to lure the user to a malicious site. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious.

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.link/pify?keyword=confirming+interview+email+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/9662933545.pdf
    • https://cdn.shopify.com/s/files/1/0428/1915/8183/files/jeruxikexurutemezokuxawo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3504/9640/files/how_to_write_business_plan_for_startup.pdf
    • https://cdn.shopify.com/s/files/1/0440/1076/6486/files/midas_heritage_d.pdf
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/45173362077.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9109/files/17635740304.pdf
    • https://cdn.shopify.com/s/files/1/0438/7058/4987/files/58301618054.pdf
    • https://cdn.shopify.com/s/files/1/0439/0764/5595/files/research_methods_in_behavioural_science.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdf
    • https://cdn.shopify.com/s/files/1/0436/0388/6238/files/69860238249.pdf
    • https://static.usrfiles.com/ugd/b910ae_50c6c0ca96ee4e49a54353a15c572f6e.pdf
    • https://static.usrfiles.com/ugd/405339_d76d409cd02d4f2888b867dd04092e42.pdf
    • https://static.usrfiles.com/ugd/e23fbb_195e8386b3ae46b7a12c242765eefbbd.pdf
    • https://static.usrfiles.com/ugd/dad90e_dfe4ad993eab40528c6150201f1041bc.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_off00007436.bin
94adfdea83858212bcf10dc9f5311723d7476c93f1ace82b3c306a3d7936a88a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7436 5100 bytes
font_01_sfnt_off00008592.bin
01ed06648459e361e32e807c4716c81f12a99ef22de8e3af2dddced7410e8506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8592 9808 bytes

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