Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71722b39d6fa1d0…

MALICIOUS

PDF

42.5 KB Created: 2020-08-23 08:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f39e570342c671ec40d1c92632a0d15 SHA-1: 20f53292eb7994873a1cf9249e5dd652667ceb71 SHA-256: a71722b39d6fa1d056d4d82bc52f67da7f6a4ea5a135568ff5d723cdc1defc2a
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a phishing or scam attempt, likely using the 'guided reading level second grade' lure to entice clicks. The ML classifier strongly supports the malicious nature of this PDF.

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=guided+reading+level+second+grade
    • http://wapobewuw.drferreras.com/uploads/1/3/2/7/132710657/436928.pdf
    • https://cdn.shopify.com/s/files/1/0435/3028/9311/files/kelalusunati.pdf
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/declarao_nostra_aetate.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8165/files/xadidopoxugasenonuse.pdf
    • https://cdn.shopify.com/s/files/1/0462/3305/9479/files/pepapufizokalemodikan.pdf
    • https://cdn.shopify.com/s/files/1/0430/6308/3162/files/71912750937.pdf
    • https://cdn.shopify.com/s/files/1/0433/3705/6414/files/64989109911.pdf
    • https://cdn.shopify.com/s/files/1/0428/2341/8019/files/28006396613.pdf
    • https://cdn.shopify.com/s/files/1/0444/1961/2839/files/basic_networking_concepts_for_interview.pdf
    • https://cdn.shopify.com/s/files/1/0434/3595/0236/files/22664727626.pdf
    • https://cdn.shopify.com/s/files/1/0430/5498/9466/files/70289352562.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_off00006859.bin
0d783350c8e186b7fab966101006d354dc6ab1b14fe88b5ce4e3b2e64d165e96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6859 5200 bytes
font_01_sfnt_off00007a1b.bin
897a757f3c472d1b460cf0639c0bfa0c371040780a7e2311e8d86bf5a3607f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1B 10336 bytes

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