Malicious PDF — malware analysis report

Static analysis result for SHA-256 6493d91712e6d3fa…

MALICIOUS

PDF

48.0 KB Created: 2020-08-18 17:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5135dd143b1e509e7ea2c0f6e30d976 SHA-1: 22e3ab2069aeb062801033a221812e90d2a133f2 SHA-256: 6493d91712e6d3fa6a9d1ad0bd199a993f5824c98bdfcc29478906f6c5952cd3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though malformed, also contains this URL, suggesting an attempt to lure users to malicious content. The presence of a link farm further indicates a malicious intent to distribute or redirect traffic.

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=culture+shock+esl+worksheet
    • http://files.lasalservices.com/uploads/1/3/1/4/131455283/fadojefonodado.pdf
    • http://files.chzaz.com/uploads/1/3/0/7/130776519/vutowu.pdf
    • http://kudew.fullcirclewellnessretreats.com/uploads/1/3/2/8/132814930/5017518.pdf
    • http://kejomi.woodbridgepsychicfair.com/uploads/1/3/2/7/132740873/2322846.pdf
    • http://files.rhettisemantrull.net/uploads/1/3/1/0/131070476/b65829bc67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/1994/1541/files/14392344680.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/72724464031.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/tuladigitokixexusow.pdf
    • https://cdn.shopify.com/s/files/1/0437/4895/0170/files/bill_of_lading_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/8382/4294/files/73009651172.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/91627711904.pdf
    • https://cdn.shopify.com/s/files/1/0450/2500/1630/files/nomenclature_of_aromatic_compounds_rules.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_off00007dde.bin
dfd136045fc871abecad7f1b1d3c8ac924e39018693519b355653496bbcf044f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDE 4740 bytes
font_01_sfnt_off00008e09.bin
a6e562513e9ef8209068aef970cea9cb2cd27ab54f98a8ae2c02cb75a60bf01a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E09 10460 bytes