Malicious PDF — malware analysis report

Static analysis result for SHA-256 10313be62cc6edb5…

MALICIOUS

PDF

41.2 KB Created: 2020-08-31 01:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d84c39b82aaac22b208cbd0f5760abf SHA-1: eee6d5ce57e16da2d10ad2e272a8f633ead42ef6 SHA-256: 10313be62cc6edb5fb610a4b795a702525f6dfc8ed555f6cc635396f6f37ffbd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous Shopify URLs, many flagged as benign, indicates a potential attempt to blend malicious links with seemingly legitimate ones, a tactic often used in SEO link farms to mask malicious activity. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=giri%25C5%259Fimcinin+el+kitab%25C4%25B1+yorum
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8589/6609/files/serotonin_syndrome_symptoms.pdf
    • https://cdn.shopify.com/s/files/1/0460/1872/3999/files/vipugofikis.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/dibujo_arquitectonico_basico.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/18869559233.pdf
    • https://cdn.shopify.com/s/files/1/0430/4060/4314/files/18736124509.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xifadek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5558/files/50388703254.pdf
    • https://cdn.shopify.com/s/files/1/0437/8250/4600/files/ludalosivis.pdf
    • https://cdn.shopify.com/s/files/1/0434/6445/8405/files/pdf_xchange_editor.pdf
    • https://cdn.shopify.com/s/files/1/0438/4188/0224/files/wunepasajekudobiwakore.pdf
    • https://cdn.shopify.com/s/files/1/0463/6318/1217/files/kikajulozakisobebuvadewa.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/62032989929.pdf
    • https://cdn.shopify.com/s/files/1/0434/3804/7384/files/lutusigulili.pdf
    • https://cdn.shopify.com/s/files/1/0428/4124/3814/files/76021062506.pdf
    • https://cdn.shopify.com/s/files/1/0440/6244/1637/files/79820947207.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_off00005ecd.bin
5c6d802361c5dd1d13474c863d21fdaaea9e5bd3544c559a4634973910e94a8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECD 5384 bytes
font_01_sfnt_off00007109.bin
e269ab2ce6e9217426323f7c61c84a4d2f391f41948fe8b1eddeb1a8f09cd8cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7109 12212 bytes

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