Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f875ae42b4c651b…

MALICIOUS

PDF

53.7 KB Created: 2020-08-21 12:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42bd1b58a113b54c874cfb1c870fe3ca SHA-1: 7c9b82da69b955dcd5125a7a43ed7d63fc364d02 SHA-256: 0f875ae42b4c651b5a5e29060a319bfa6df672c86fe1a25730f210a22cd0fbbb
162 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 'ttraff.com'. The document body, though heavily obfuscated, contains the same malicious URL and a large number of other URLs, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The presence of a 'download button' heuristic further supports a lure-based attack. The primary malicious URL is likely used to redirect users to a phishing page or a malware download.

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.
  • 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/pify?keyword=chinese+zodiac+movie++in+tamilyogi
    • http://files.greenfieldcommunitychoir.com/uploads/1/3/1/4/131455283/61014.pdf
    • http://files.babuni.ca/uploads/1/3/1/8/131872149/4784547.pdf
    • http://notiliz.blacksmithspdf.com/uploads/1/3/1/3/131380213/veleneveziguk.pdf
    • http://files.dagcamera.com/uploads/1/3/1/6/131636907/8735520.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/sopibematatokezadoniwem.pdf
    • https://cdn.shopify.com/s/files/1/0435/0722/0635/files/zuxeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22945880436.pdf
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/calendario_mundial_rusia_2020_hora_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/49773099063.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/kerugapazavujuzesov.pdf
    • https://cdn.shopify.com/s/files/1/0431/0591/0935/files/25286366877.pdf
    • https://cdn.shopify.com/s/files/1/0428/3141/3404/files/gefewetowejowidub.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/32723074998.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6845/files/miwerusabeka.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086eb.bin
27b748ee931503da7bbd748c21e6b962001e2b36dc9ea055ea975387d771fc72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86EB 3212 bytes
font_01_sfnt_off0000926a.bin
184648668f43afc24a2d97416733e5e3fd612e631d944954af4de18d0b3a741f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x926A 5376 bytes
font_02_sfnt_off0000a4a0.bin
10c525a5fe1a2e6e40e93bec920ac028627bf91fb79ae0cf5d6e7ddc4c568473		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4A0 11212 bytes

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