Malicious PDF — malware analysis report

Static analysis result for SHA-256 7199a91cb287edf1…

MALICIOUS

PDF

40.1 KB Created: 2020-07-28 07:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa33bcf0c524b1239f7f42a7b28c622c SHA-1: 69c3ec0610d5c73c888344686532db341605213a SHA-256: 7199a91cb287edf16f6891b430282ad3d11afa3614685d94b5574b02c15507d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, with one heuristic specifically identifying it as a link farm pointing to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links suggests an attempt to drive traffic to malicious sites.

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=coelho+books+free
    • http://files.thepartyeng.com/uploads/1/3/2/3/132302780/d1243.pdf
    • http://files.rutilawashburnancestry.com/uploads/1/3/0/8/130813696/dakirukenaferotirux.pdf
    • http://files.lifestyleofthebeliever.org/uploads/1/3/1/4/131455543/nejixufowav-namow.pdf
    • http://files.mbjinsurance.com.au/uploads/1/3/0/7/130740320/2170038.pdf
    • http://files.creamycrackshop.com/uploads/1/3/0/8/130874433/2592626.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9436/0743/files/matirokojoxusosat.pdf
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/nokopiluwuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1110/files/rizujosena.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/87482607163.pdf
    • https://cdn.shopify.com/s/files/1/0432/4415/9143/files/30562720054.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/63835457573.pdf
    • https://cdn.shopify.com/s/files/1/0428/5100/8671/files/ginalarurami.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/rofogodisinegitovuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/39138479090.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kubogofire.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/zamavodanarajata.pdf
    • https://cdn.shopify.com/s/files/1/0431/6138/7170/files/89459197881.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_off00006143.bin
4264e5f53f904719b43470a3b07c8af760f9781d2e0171490fbf32f74589f6f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6143 4428 bytes
font_01_sfnt_off00007056.bin
713b5dac5cc8c2e17447242aade51020dc61b340541fdd6a360ce8642c88de46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7056 10116 bytes

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