Malicious PDF — malware analysis report

Static analysis result for SHA-256 734acd25d5e924e5…

MALICIOUS

PDF

44.1 KB Created: 2020-08-13 23:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41d553f68803e7f4c605681e993b22aa SHA-1: 72a2084adfc16824bebb5eb0e7169251ed4bb320 SHA-256: 734acd25d5e924e5b7b0fcb67ef20dd480f79051ec2243f1f1840bf9b5f2baf9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=conscious+sedation+guidelines'. The document body, though partially corrupted, includes text related to 'Conscious sedation guidelines', suggesting a lure to trick users into clicking the malicious link. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=conscious+sedation+guidelines
    • http://xuwirimog.fromthebottom2thetop.com/uploads/1/3/2/8/132814930/b299e4e2.pdf
    • http://files.drdeirdra-faithcounselingllc.com/uploads/1/3/1/8/131871625/zuwimiluluf.pdf
    • http://files.learningwithdigitaltechnologies.com/uploads/1/3/1/4/131438211/lofube-pupufasinuxowos-zezeleninov-muvapote.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7487/9641/files/sijifew.pdf
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/21534237760.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/62368753950.pdf
    • https://cdn.shopify.com/s/files/1/0430/8815/0690/files/zogememinofiwusezogato.pdf
    • https://cdn.shopify.com/s/files/1/0433/7657/4620/files/69607993464.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/jibejax.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2472/files/33516533733.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/jokoxedomomosipelobuz.pdf
    • https://cdn.shopify.com/s/files/1/0440/4540/2277/files/78647561920.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24221046066.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gujogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72710717911.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_off00006d5b.bin
dceba82c5af3bb2c129480434fa70bc575ebff08175520012bcd94b62d65f89d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5B 4916 bytes
font_01_sfnt_off00007e1e.bin
6adb85f452a48f2dfc389fd15b48a175ba7dcdb316ba04faaa5bea24d7c50f15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E1E 11776 bytes

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