Malicious PDF — malware analysis report

Static analysis result for SHA-256 861708c3ea4357dc…

MALICIOUS

PDF

34.2 KB Created: 2020-08-09 21:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f873f402c0e66e890e8afb01f20faaee SHA-1: b5c15e00a24bbfd889ef5dd4b3d81bd9aceac52c SHA-256: 861708c3ea4357dcb77e2b3a9e785976d51d15f4f589fd68d611972a614d4b1e
154 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 a link farm designed to manipulate search engine results. One of the primary links directs to a malicious redirector, `https://ttraff.cc/pify?keyword=big+data+processing+with+hadoop+pdf`, which likely serves as a lure for further malicious activity. The document body itself is heavily obfuscated but contains references to the redirector and other benign-looking PDF files hosted on Shopify, suggesting a deceptive tactic to mask malicious intent.

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.cc/pify?keyword=big+data+processing+with+hadoop+pdf
    • http://files.maineanchor.com/uploads/1/3/2/6/132695663/315ddc4.pdf
    • http://files.knowingourpast.com/uploads/1/3/1/1/131163834/148198.pdf
    • http://files.beaconsfieldfestivalofchoirs.com/uploads/1/3/1/3/131384127/direroje-gowivotu-zeduti.pdf
    • http://fixozagov.arttherapycolorado.org/uploads/1/3/1/3/131379730/1815320.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7569/7830/files/90562150126.pdf
    • https://cdn.shopify.com/s/files/1/0429/3358/4035/files/55005093421.pdf
    • https://cdn.shopify.com/s/files/1/0432/6644/1376/files/castle_crashers_weapons.pdf
    • https://cdn.shopify.com/s/files/1/0435/5548/7905/files/57461086568.pdf
    • https://cdn.shopify.com/s/files/1/0438/8411/8171/files/biology_notes_12th_class.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8032/files/56936443891.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4567/files/9995689686.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4827/files/10276132199.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/dabowime.pdf
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/suloruwuwitajukudurik.pdf
    • https://cdn.shopify.com/s/files/1/0436/4890/9462/files/airman_ga_taosenai.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_off00004602.bin
f203658919fe0ca6fd1a24069cbaf69016a75d9dedcf5ec079f68bd01950bd8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4602 5528 bytes
font_01_sfnt_off000058e3.bin
b2316bb0e5cf5b660ee25971ed969429a81bb0a9764001241e8cab917bbc2e32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58E3 10344 bytes

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