Malicious PDF — malware analysis report

Static analysis result for SHA-256 68381ddd05e80476…

MALICIOUS

PDF

45.1 KB Created: 2020-08-22 07:39:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8416f7c3dde62a7d5a82847192b294a SHA-1: 0b2cc2fccfc5881edfcd4b64bed84e0c64844a3b SHA-256: 68381ddd05e8047629b03afd2c98980d23f3217a50be1aaa7f5fedd1aed0e752
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a deceptive lure for 'Whatsapp for nokia 216 free' and embeds numerous links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic indicates a direct link to known malicious redirector infrastructure, which is the primary IOC. The ML classifier strongly supports the malicious nature of this PDF.

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=whatsapp+for+nokia+216+free
    • http://kukuxo.becomingscollective.org/uploads/1/3/0/8/130814328/6020418.pdf
    • http://vebasinob.mrsperkinsworldhistory.com/uploads/1/3/0/7/130776356/pubipuba.pdf
    • http://vapek.fineartscamp.org/uploads/1/3/2/7/132740930/da53c5d4a17c5.pdf
    • http://fisetove.picksandreadsforkids.com/uploads/1/3/0/9/130969572/tivugaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1468/3813/files/sagilasovifowixamizakomej.pdf
    • https://cdn.shopify.com/s/files/1/0464/5866/7176/files/28864905757.pdf
    • https://cdn.shopify.com/s/files/1/0428/1401/3606/files/47709314999.pdf
    • https://cdn.shopify.com/s/files/1/0439/0351/6824/files/40944120818.pdf
    • https://cdn.shopify.com/s/files/1/0430/8271/1201/files/10099597660.pdf
    • https://cdn.shopify.com/s/files/1/0434/4745/1798/files/homeworld_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/8831/3506/files/sarujafobodewebidifani.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/autocad_2d_and_3d_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0437/9289/2061/files/libro_breviario_de_los_politicos.pdf
    • https://cdn.shopify.com/s/files/1/0432/7745/1428/files/project_superhuman_1._7._10.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_off000071e9.bin
896ee5a213b12b5365e650bc948f030f44f00390616da3a688d657e93c1faf3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x71E9 5372 bytes
font_01_sfnt_off00008442.bin
ef4eb7f30a9471129ab57fb2811fdc013ef187cb0faf344b45395a578b6d532e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8442 10420 bytes