Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb6c5ca4e425485…

MALICIOUS

PDF

66.3 KB Created: 2020-07-30 13:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 665f0759118c7cbea6eabf33db6bd78b SHA-1: a71cc8dce90468da650aca236c08c83c9c3300ac SHA-256: 6fb6c5ca4e425485ef185ebb06abf1f662d3af934304099852bbec6e6bc2f83d
162 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 a redirector service known for malicious activity. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The 'SE_URGENCY_LURE' heuristic further supports a phishing or scamming attempt.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=allergic+rhinitis+guidelines+2020+pdf
    • http://files.janedelafordtaylor.com/uploads/1/3/2/7/132710763/satixekuzukinak.pdf
    • http://files.budavet.net/uploads/1/3/1/6/131636678/jixufirin-vatejiwor.pdf
    • http://files.nowakemusic.com/uploads/1/3/2/3/132303082/likanazevoriwojizix.pdf
    • http://files.twocities.ca/uploads/1/3/2/7/132740339/xasufawigazo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/98004697148.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2874/files/mutiboti.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1082/files/sitize.pdf
    • https://cdn.shopify.com/s/files/1/0432/3514/7933/files/62700082442.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7454/files/mukitofusefibotajetuxubik.pdf
    • https://cdn.shopify.com/s/files/1/0437/3626/8949/files/kokaxin.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4150/files/15852757450.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/32548005065.pdf
    • https://cdn.shopify.com/s/files/1/0430/1144/0803/files/jopididaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/wogodobajowopatokamogo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/bixavirenege.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/10711729991.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7182/files/3454089640.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/zifutijuwulubibedewe.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_off0000bb39.bin
64e2e1ee2e72182fcb5b77d50a2aae9a95082b191c28ad6250065a929b41f39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB39 5240 bytes
font_01_sfnt_off0000cd07.bin
c4be4d8710336b03ad0ba1cd2bc4fcf55d9b57f6802794882cba860fdf60f3e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 14588 bytes

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