Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1850e22752f3f5e…

MALICIOUS

PDF

45.0 KB Created: 2020-08-02 05:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 147b73bb828c130ec9a579b958a84b5e SHA-1: 5d6ac401bda29c18ac88bf4ffbb40b8c7ddd33ef SHA-256: f1850e22752f3f5e8bc6c30ac2171ab4831c9f9a0d44c050167a0041a9f6389d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.ru/pify?keyword=hello+book+of+mormon+lyrics'. This indicates the document is designed to redirect users to malicious sites. Additionally, the PDF hosts a large number of external links, many pointing to Shopify domains, suggesting a link farm or distribution mechanism. The ML classifier also strongly flagged this PDF as malicious.

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=hello+book+of+mormon+lyrics
    • http://files.dbardogs.com/uploads/1/3/1/3/131380390/tubolex_wukog.pdf
    • http://files.videogamelegacy.com/uploads/1/3/1/4/131453924/ad9d903.pdf
    • http://files.pltnutritionandfitness.com/uploads/1/3/1/0/131070204/62d4a4.pdf
    • https://cdn.shopify.com/s/files/1/0432/1781/3661/files/94052153295.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/38627953533.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lojuxefututa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8357326041.pdf
    • https://cdn.shopify.com/s/files/1/0437/5950/1464/files/can_mobs_spawn_on_bedrock.pdf
    • https://cdn.shopify.com/s/files/1/0436/4242/1398/files/gapurugitujoduzor.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0865/files/54895183182.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuxopikuxoxixu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3699/7782/files/92518424012.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/98494498970.pdf
    • https://cdn.shopify.com/s/files/1/0431/8760/1559/files/99961713054.pdf
    • https://cdn.shopify.com/s/files/1/0429/4089/1292/files/texow.pdf
    • https://cdn.shopify.com/s/files/1/0429/9679/3503/files/84927909049.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_off00006625.bin
a0a73acddbeba78d87f5fed098b43b6c194402cdb59228dcdf305c3378b611f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6625 4792 bytes
font_01_sfnt_off00007652.bin
7d224b41f013f7e92c28a4fb6e875dc3eceb9d1e7b0fb8d9186247e37596ab95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7652 10132 bytes
font_02_sfnt_off00009909.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9909 4324 bytes

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