Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b2642d2b47e5fa…

MALICIOUS

PDF

39.7 KB Created: 2020-07-28 13:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d0e6fbbf913586c5f9344acf8986950 SHA-1: 156f83372fc97b4d51d043ec79265ec723cd3125 SHA-256: 83b2642d2b47e5fa586107fcfe1a1094c43d333d5626edf2bb8b9c89bc5fe393
174 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure and a large number of other PDF files, suggesting a link farm or SEO abuse tactic. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt a phone call for a fraudulent purpose, consistent with callback phishing or tech-support scams. While no scripts were extracted, the ML classifier strongly flagged the 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.com/pify?keyword=continence+aids+payment+scheme+guidelines
    • http://files.iuoelocal609.org/uploads/1/3/0/7/130776327/giwomevolixosu_zovonuribasex_saxewiduban_vupekedotaru.pdf
    • http://files.cr-routines.com/uploads/1/3/0/8/130813827/muneli_joguwapirufaxi_xulod.pdf
    • http://files.fatimaschool.org/uploads/1/3/1/4/131453018/lasixobu-kezitezize-zimaminesix-bovudipaduvav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/megasasuxerorevu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4954/1013/files/limoxik.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/dininakekodawa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6998/0320/files/zumutubefosutademumominud.pdf
    • https://cdn.shopify.com/s/files/1/0432/7004/5864/files/simaneba.pdf
    • https://cdn.shopify.com/s/files/1/0431/5486/6333/files/55723448687.pdf
    • https://cdn.shopify.com/s/files/1/0433/8155/5350/files/95187252581.pdf
    • https://cdn.shopify.com/s/files/1/0435/4670/6088/files/tadukowagojulosediwo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/13946550482.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/kukeligubuvadogupigojema.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/18489147098.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_off00005df7.bin
ed6edb9ffb1e2fcdf6dda94d1bb491880f09ef60b0d0be06c011517c8e575416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF7 5396 bytes
font_01_sfnt_off00007033.bin
1009261f5a966834b499a45521dcf456692ca4a97ecb910b1cd8190e1f37f1a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7033 9816 bytes

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