Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b50eea04001dda…

MALICIOUS

PDF

42.5 KB Created: 2020-07-10 11:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: e9bc3f5d050edf7cbabb9c170198d0ce SHA-1: 386ab0a72d0ba931584d4e3c3d4a4da6d8a9ebad SHA-256: 85b50eea04001ddaf77c1b4e623cbdd63c656a91e18bec9f5cf47849576ee7c1
192 Risk Score

Malware Insights

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

The PDF contains numerous links disguised as a "document to pdf converter for windows 10" lure. These links point to a link farm hosted on disposable domains, with the primary redirector being ttraff.com. The ML classifier strongly indicated maliciousness, and the structure suggests a phishing or redirection campaign.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/wb?keyword=document%20to%20pdf%20converter%20for%20windows%2010 In PDF document text
    • http://files.dorebowen.com/uploads/1/3/1/6/131607174/3994866.pdfIn PDF document text
    • http://files.antoniodavidsinopoli.com/uploads/1/3/0/8/130873907/4090271.pdfIn PDF document text
    • http://files.confidentlyuare.org/uploads/1/3/1/4/131437131/jifemexukutorop.pdfIn PDF document text
    • http://files.grandbendsoccer.ca/uploads/1/3/1/8/131871894/mirelukexuger.pdfIn PDF document text
    • http://files.orangehistory.org/uploads/1/3/1/3/131380998/6a7d3c8e67aa6.pdfIn PDF document text
    • http://files.cathedralmountainknifeworks.com/uploads/1/3/0/9/130969673/miweg_farov.pdfIn PDF document text
    • http://files.friendsofembryhills.org/uploads/1/3/1/6/131607575/logile-mojagufebig-jonimuw-kexinokiru.pdfIn PDF document text
    • http://files.sprucetopsmn.com/uploads/1/3/0/7/130739571/gusezunusuzeme_pitewozeluxobo_texutefiwimat.pdfIn PDF document text
    • http://files.pianolessonsontheweb.com/uploads/1/3/0/7/130775700/gilekefiwo-nuruwa.pdfIn PDF document text
    • http://files.sydneynewhorizons.org/uploads/1/3/2/7/132710787/lozaratorepu_tatira.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xewugof.files.wordpress.com/2020/06/kejidalipin.pdfIn PDF document text
    • https://xonijug806904596.files.wordpress.com/2020/07/31143035291.pdfIn PDF document text
    • https://xawuwoliv.files.wordpress.com/2020/07/33097103037.pdfIn PDF document text
    • https://kolurinitof.files.wordpress.com/2020/07/73036539653.pdfIn PDF document text
    • https://tojufedeken.files.wordpress.com/2020/06/90547429407.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14985018959.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jikoleluvotejagumali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dagezaluvonanapukinuwit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22650439267.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6836 5288 bytes
SHA-256: a9187057d362df79fb183d3070e3a614f16b7ae8673bd3931bd5c24c848010ce
font_01_sfnt_off00007a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3E 10128 bytes
SHA-256: 588a88523f6fa99a2a7ce6abed2118301f431d2d1bce297605cea1c6345d7bd2