Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a6ae2b91a42680…

MALICIOUS

PDF

35.4 KB Created: 2020-08-08 20:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee183fa3b6678a040145f081b22f18e2 SHA-1: 4947621beb416de497494ebaa51361b4e1699d29 SHA-256: 73a6ae2b91a42680e43f18e3998cfa967eefea742b6332d72ac121fea240c94c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=the+blue+book+of+grammar+and+punctuation+pdf+free`. The document body, though heavily obfuscated, contains text related to a grammar book and the malicious URL, indicating a lure to trick users into clicking the malicious link.

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.cc/pify?keyword=the+blue+book+of+grammar+and+punctuation+pdf+free
    • http://files.reclaimvitality.net/uploads/1/3/1/1/131164239/675009.pdf
    • http://files.iowaheartlandscte.org/uploads/1/3/1/3/131380000/9982346.pdf
    • http://files.3mbc.org/uploads/1/3/0/8/130815115/xevek.pdf
    • http://files.justinadamson.com/uploads/1/3/1/3/131380985/vavorigojasazo-vapufamune.pdf
    • http://files.glassondemandinc.com/uploads/1/3/2/7/132740805/128bee96f700189.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2668/5850/files/fusionner_diviser_en_ligne.pdf
    • https://cdn.shopify.com/s/files/1/0434/3729/3724/files/minefesowotidikifadavera.pdf
    • https://cdn.shopify.com/s/files/1/0449/3679/0171/files/community_acquired_pneumonia_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0429/0327/3628/files/fonow.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/40855899534.pdf
    • https://cdn.shopify.com/s/files/1/0447/8540/2013/files/a_h_salunkhe_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/73456468809.pdf
    • https://cdn.shopify.com/s/files/1/0437/9371/1265/files/free_printable_cards_for_all_occasions.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0330/files/nested_for_loops_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46946939033.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_off00004d92.bin
82066a82e08ff54470318e0c05bdf3ef78aec4c44f609bf4f1f61dd1c9bc08d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D92 5544 bytes
font_01_sfnt_off00006045.bin
3cc8837754219b5284619a03f03f112a33d05c9d362cfb1de46fa24a077e249b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6045 9520 bytes

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