Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8879ab5ccad5ffa…

MALICIOUS

PDF

44.4 KB Created: 2020-07-30 06:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecc43c63054bd10c389ca67f034a510e SHA-1: 1d5f54413c983208b4d0335e22ec5c69ce105957 SHA-256: f8879ab5ccad5ffa8af559b20e831d7cba0a1ddf89349640e0dfcc6c204b6bf2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic indicates these links point to a known malicious redirector infrastructure. Another critical heuristic identifies the PDF as a link farm, with many links pointing to external Shopify domains, suggesting an attempt to manipulate search engine results or distribute content. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

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.com/pify?keyword=categories+of+exceptionalities+pdf
    • http://files.ncmusictherapy.org/uploads/1/3/1/0/131070051/fipexuvelororej_juguliretafino_wokamewixa_gitirarijam.pdf
    • http://files.mycorbintoncommons.com/uploads/1/3/1/3/131380547/gapatapanibilugos.pdf
    • http://files.drhartnell.com/uploads/1/3/1/3/131382673/1081973.pdf
    • http://files.mauriceparent.com/uploads/1/3/2/3/132302924/1402060.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/dupuxixipivonide.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9512/files/rabomesosulogizaxato.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5882/files/rutamamogoki.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1518/files/makinisozikisofezup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75555741983.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6264/files/44190831363.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/50906487045.pdf
    • https://cdn.shopify.com/s/files/1/0429/0124/2022/files/buzam.pdf
    • https://cdn.shopify.com/s/files/1/0432/2702/1480/files/dadelomerufepukubexegosak.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/kokexosefav.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8775/files/zezidikosakedodagavagipa.pdf
    • https://cdn.shopify.com/s/files/1/0434/8326/7234/files/fibaz.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/
    • https://cdn.shopify.com

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007204.bin
f932eb6c7d3eab87a7b35173b323501c17ccf77b06adcd9cca4a30b857041b80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7204 5204 bytes
font_01_sfnt_off000083d0.bin
507d2315d3f8f985ca5363de75c1f930fae021a133222c1be5332c67ecfd02f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D0 9468 bytes

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