Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb838867524d84d9…

MALICIOUS

PDF

37.0 KB Created: 2020-08-16 16:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d307cc1bb4deb8d7b001df0a1cc8a7f2 SHA-1: cfe270ac334d4db101fdefb547886d6eafa9aaa8 SHA-256: cb838867524d84d9e5fd54b54dbe96bb06e0f71039bee7596208ff57a8913913
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. The presence of a link farm, with many links pointing to Shopify-hosted PDFs, suggests an attempt to artificially inflate search engine results or distribute further malicious content. No scripts were extracted, and the primary malicious activity appears to be link manipulation.

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=mn+dnr+stocking+reports+2019
    • http://files.asce-slo-ymf.com/uploads/1/3/1/4/131407493/fagodulu.pdf
    • http://files.laspiritualarts.com/uploads/1/3/2/7/132740467/3046369.pdf
    • http://files.lynnmadsenmd.com/uploads/1/3/1/0/131070045/kagasuzi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/17052855064.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/14367544157.pdf
    • https://cdn.shopify.com/s/files/1/0429/6356/6755/files/77309042971.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/marketing_management_articles.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/wiwim.pdf
    • https://cdn.shopify.com/s/files/1/0434/0881/8333/files/gegujigamo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5128/files/fortnite_battle_royale_mobile_ios.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/23380826728.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/37808910563.pdf
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/brand_identity_proposal_sample.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nenipuwewof.pdf
    • https://cdn.shopify.com/s/files/1/0430/6488/5402/files/77849273122.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005250.bin
0d7fb6ccaae0c6681734e33c06915b5abe6a8e72015f2db88da1b4db86e6b834
pdf-font-stream PDF embedded font (sfnt) at offset 0x5250 5548 bytes
font_01_sfnt_off00006552.bin
363680fd7b71b7ea29a5d85aa34efe8267d3ee21293207d92e715b8f9dbcc808
pdf-font-stream PDF embedded font (sfnt) at offset 0x6552 9944 bytes