Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d4a142c731393c…

MALICIOUS

PDF

48.8 KB Created: 2020-08-11 19:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 880b52765d051513060fe2efa86c9f25 SHA-1: 50c3b0ee8d659de95faa6e2f71c5cbe4fb72de68 SHA-256: 16d4a142c731393cdc9998227ad5c09efb5290ec908fe7c8edd65af9f79eec05
202 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One critical finding is a link to a known malicious redirector, https://ttraff.cc/pify?keyword=the+costs+of+adverse+drug+events+in+hospitalized+patients+pdf, which likely serves as a gateway to malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=the+costs+of+adverse+drug+events+in+hospitalized+patients+pdf
    • http://files.truthiflifemin.org/uploads/1/3/1/4/131438111/3116978.pdf
    • http://files.supernaturalentertamitedproductions.org/uploads/1/3/1/4/131455883/visemomitowezij-fezaweku-xevut-kixivim.pdf
    • http://files.safehavensavings.org/uploads/1/3/1/3/131379290/lugewuvojofibebuvape.pdf
    • http://files.elisehilderphotography.com/uploads/1/3/2/6/132682745/vuvijis_nimotevo_mumoxotegazopab_lapata.pdf
    • http://gixob.catalyst-now.com/uploads/1/3/1/4/131453541/8048751.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2137/6410/files/93925046179.pdf
    • https://cdn.shopify.com/s/files/1/0428/3888/4519/files/borudanageno.pdf
    • https://cdn.shopify.com/s/files/1/0439/4788/4702/files/85981838389.pdf
    • https://cdn.shopify.com/s/files/1/0451/8104/2839/files/effects_of_plastic_pollution_in_the_ocean.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4220/files/mechanical_engineering_projects.pdf
    • https://cdn.shopify.com/s/files/1/0431/6777/6919/files/valer.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/tubutivaxemaluvajenidomaz.pdf
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/jedisafemolivaxivabudifa.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/36334100467.pdf
    • https://cdn.shopify.com/s/files/1/0434/0993/2440/files/jetenifowatolojufesaxab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/demotufilonameviv.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_off00008019.bin
b5c96c3c8c5cbb64313f7ef8a1027cfa1bcf5681f5a1bdc15276b505910f78b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8019 5476 bytes
font_01_sfnt_off000092c2.bin
d6fbe465fe5196f9e1fe57d1970722d08059c3bb8f1d79ba877f0d82d5984fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92C2 10188 bytes

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