Malicious PDF — malware analysis report

Static analysis result for SHA-256 16092cdaea18904b…

MALICIOUS

PDF

48.8 KB Created: 2020-08-20 20:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 756573af464ac61c6e33a533cee5b0ff SHA-1: e5646a9ed8690c800aeb8450637cdc7ed051edb1 SHA-256: 16092cdaea18904b8fb2a39189e95e9968e59f06db6cdfe53cffb7036e0eff5c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with many pointing to Shopify-hosted PDFs. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be the creation of a link farm or SEO manipulation, with a malicious redirector present.

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=fructose+malabsorption+guide%2528+low+fodmap+diet%2529
    • http://files.10sided.com/uploads/1/3/2/6/132695416/7f5e4b3917.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/xokixojalafogubivopemu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5666/0633/files/soteduripaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7966/3765/files/scope_of_employee_retention_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/0532/0088/files/15202420918.pdf
    • https://cdn.shopify.com/s/files/1/0438/9660/2779/files/activity_based_learning_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0435/8681/4109/files/govomogojila.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/definicion_de_metales_alcalinos.pdf
    • https://cdn.shopify.com/s/files/1/0435/5430/8245/files/viladabenexigax.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/riwonuzopedege.pdf
    • https://cdn.shopify.com/s/files/1/0434/1740/3559/files/sea_of_thieves_review_game_informer.pdf
    • https://cdn.shopify.com/s/files/1/0431/0332/2261/files/lexolokosezoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7299/4971/files/volap.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/76161190198.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8041/files/dojuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/6438/5951/files/62282719726.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007221.bin
e1c76a6f1ef679911f71383f4736de793b3633f607b84f4e5d8817e3b9461cb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7221 5696 bytes
font_01_sfnt_off0000857c.bin
5e379d3d3b99df3d30c7391b404ee40bae5ab690fc59db1b8a075040f60c74cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x857C 10128 bytes
font_02_sfnt_off0000a82e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA82E 4324 bytes

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