Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c639d265d864b0e…

MALICIOUS

PDF

48.5 KB Created: 2020-08-12 18:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6cb8de65b1b9838795b8785d97910d1 SHA-1: 3a3612582b88f7ba822210fd3c6a8723a07f9583 SHA-256: 2c639d265d864b0e890f733933cc25660125959cd072470ad955b2a80ff48b46
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a link farm or SEO poisoning tactic designed to lure users to malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of the malicious redirector is the primary indicator of compromise.

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=pdf+editor+highlight+colors+online
    • http://files.thomscer.com/uploads/1/3/2/6/132681212/wonewoxuxen.pdf
    • http://furatu.heathernorman.co.uk/uploads/1/3/1/0/131070841/7219513.pdf
    • http://files.hinesburgartistseries.org/uploads/1/3/1/0/131070581/madesimazigoli.pdf
    • http://files.southcentraldallasbpwc.com/uploads/1/3/2/6/132681823/xakogopiloj.pdf
    • http://files.erskinebadmintonclub.co.uk/uploads/1/3/2/7/132740511/ralibikik_polof_telubevizabop_borumisofekutav.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1695/files/66325131422.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/jogizafipimiket.pdf
    • https://cdn.shopify.com/s/files/1/0435/5407/8883/files/jivajafesumitenizadid.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/anthroposophic_medicine.pdf
    • https://cdn.shopify.com/s/files/1/0432/1922/2687/files/pray_to_receive_the_baptism_of_the_holy_spirit.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/lidila.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1560/files/44444059184.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/sesadix.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/cessna_182_ipc.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7055/files/10854755154.pdf
    • https://cdn.shopify.com/s/files/1/0437/2050/7546/files/99835698877.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/79528684823.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bec.bin
a7fb54cb4eea2028d304a1b20a2025197f846a61c683e65efd71bca07072f930		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEC 5076 bytes
font_01_sfnt_off00007d2c.bin
ca48e01dfd202f32b985d53dbc90de2bcb8c4d1a92b57ad11b3accfb306b11bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2C 10016 bytes
font_02_sfnt_off00009f99.bin
5570ae8fa562a837499aa87710aed0b2bc48f7e42481059dc68e183d0697d456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F99 16128 bytes

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