Malicious PDF — malware analysis report

Static analysis result for SHA-256 8851afb9b1a36611…

MALICIOUS

PDF

42.4 KB Created: 2020-07-10 11:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b041c53fed3cf4eb61a273df73ed4ccf SHA-1: bf7f1f534a47da54b23ef0910f24151deb9533fa SHA-256: 8851afb9b1a366118c78c259a9b561af5bae7b8a020e958fb7891e400c217267
184 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting domains. The primary link redirects to 'ttraff.cc', a known malicious redirector. The document body, though heavily obfuscated, contains the same URLs, suggesting a phishing or scam attempt to direct users to malicious content. No scripts were extracted, but the PDF structure and embedded links strongly indicate malicious intent.

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.
  • 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.
  • 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/wb?keyword=simatic%20hmi%20tp1500%20comfort%20manual
    • http://files.cariblit.org/uploads/1/3/0/7/130738949/1327932.pdf
    • http://files.coniferdesigninc.com/uploads/1/3/1/1/131163705/6603448.pdf
    • http://files.ncam.ac.nz/uploads/1/3/0/7/130776788/a94fe6a1c2f25a.pdf
    • http://files.verticalmilerally.com/uploads/1/3/1/0/131070342/kekonaxej.pdf
    • http://files.peakhealthcaremaryland.com/uploads/1/3/1/4/131406816/rizapisopasiraluzoga.pdf
    • http://files.hlfmgoats.com/uploads/1/3/1/3/131383553/jopaxubesoz.pdf
    • http://files.stevedalbertconsulting.com/uploads/1/3/0/8/130814674/4489420.pdf
    • http://files.ourladyoflourdeswinnipeg.com/uploads/1/3/1/3/131382447/23d04fcc5aebf.pdf
    • http://files.jackblairgray.com/uploads/1/3/1/3/131384018/eede518175.pdf
    • http://files.randombutterflies.net/uploads/1/3/0/8/130873893/7689119.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sakeweter812408916.files.wordpress.com/2020/06/93859642437.pdf
    • https://vugifiwa.files.wordpress.com/2020/07/nunetejubagusubunuvok.pdf
    • https://buparogemi.files.wordpress.com/2020/06/56460401545.pdf
    • https://duvopuzuti.files.wordpress.com/2020/06/rabovafidudage.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/favubedezemopazejive.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47878122177.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80884551140.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_off000065ba.bin
4a640fb8c027ca0198eec9c04311c99ceee40f32d10356c1ee697ae0667d23f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BA 5260 bytes
font_01_sfnt_off00007769.bin
a31f943306c67c5b215820450461004c00c4e323a2b653b9e3f6881fad7131f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7769 10956 bytes

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