Malicious PDF — malware analysis report

Static analysis result for SHA-256 02aba7a3b41e0008…

MALICIOUS

PDF

42.7 KB Created: 2020-08-03 15:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0db5060cdd3000fac546b7b519f0dbc SHA-1: 41980de9a051df4aa50d33a984fb73d90602ed3b SHA-256: 02aba7a3b41e000827760ae8d070c666cb9d9b90b41a0ad3572662f0e9ce7f54
162 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to a redirector service, indicating a link farm or redirection attack. The document body, though heavily obfuscated, contains text related to 'klebsiella pneumoniae treatment pdf' and includes the malicious URL, suggesting a lure to a malicious site. The ML classifier also strongly flagged this 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.
  • 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=klebsiella+pneumoniae+treatment+pdf
    • http://files.gruverstreefarm.com/uploads/1/3/2/8/132814476/5187c8a1922b44a.pdf
    • http://files.stessmanlab.com/uploads/1/3/1/3/131380985/3138683.pdf
    • http://files.mannykrakowski.info/uploads/1/3/0/8/130814534/1c07091.pdf
    • http://files.vanessche.com/uploads/1/3/1/3/131381428/gedove.pdf
    • http://files.thebaptistlighthouse.org/uploads/1/3/0/7/130740496/5700663.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/21785847944.pdf
    • https://cdn.shopify.com/s/files/1/0429/7264/3491/files/vedalken_name_generator.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/mokifoduzepaseguwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/raloxejimikaboz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4577/2698/files/bajuvijetuwiza.pdf
    • https://cdn.shopify.com/s/files/1/0429/0769/7305/files/14227547481.pdf
    • https://cdn.shopify.com/s/files/1/0431/7069/3282/files/xuxetikutilapadulexak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9606/4671/files/xilazurofitefepirix.pdf
    • https://cdn.shopify.com/s/files/1/0435/9539/9325/files/debububofexotimofowosuwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/nukowojete.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/baxinabiwuxovodijasep.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/suvenuvilekowazezirelo.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_off00006852.bin
f9631a8cf72f6686d6d56f0726b836a197f9e3b2ff1d14398c8af7e4aeb5bd02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6852 5296 bytes
font_01_sfnt_off00007a39.bin
61823a348a91aaf9866c73d3ed1cc838404b332948eb4d645a29c11ba550d0e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A39 10576 bytes

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