Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b78a4022482461…

MALICIOUS

PDF

37.9 KB Created: 2020-07-30 02:40:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daea8b698ea2639b33965108f5e89774 SHA-1: 608f9d8855e7230e5cdec07072adf30ee9cfd175 SHA-256: 79b78a402248246184b035df4537d29b057e3e61ee14abc8b6117d87f413dba5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.ru/pify. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, many of which are hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to potentially malicious content via the embedded links.

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.ru/pify?keyword=assessment+procedures+for+counselors+and+helping+professionals+free+pdf
    • http://files.proorganizerlindsay.com/uploads/1/3/0/8/130874328/4020664.pdf
    • http://files.sdenvirodems.com/uploads/1/3/1/6/131607440/d8ac7af543a.pdf
    • http://files.capitalcitycivitan.net/uploads/1/3/1/3/131398542/muputidamaxape-bigekadilukirad.pdf
    • http://files.craftbreweryinsurance.com/uploads/1/3/0/9/130969485/zujinakofijajituzuzu.pdf
    • http://files.trueyoufitnesstraining.com/uploads/1/3/2/8/132815767/3a26af1dcea91.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87463685859.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/pupetivawinerawonepiwede.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/56912938362.pdf
    • https://cdn.shopify.com/s/files/1/0433/5425/9606/files/35594753877.pdf
    • https://cdn.shopify.com/s/files/1/0433/8712/5927/files/wetivuzezoramu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6509/5845/files/45407714268.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0986/files/95408869009.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/wuliw.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/kubuxuju.pdf
    • https://cdn.shopify.com/s/files/1/0430/4925/5061/files/54957705491.pdf
    • https://cdn.shopify.com/s/files/1/0438/4518/9794/files/faduwubafej.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/31218090798.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/41892792649.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_off00005879.bin
8383be27fcc1a9449e3866bbcfc258301cd8a89835685619834feac6f308c4d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5879 5440 bytes
font_01_sfnt_off00006ac4.bin
54007b85291379326179251c2b9d1c044238df2f60596bc80cd70a9270bc4d36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC4 9024 bytes

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