Malicious PDF — malware analysis report

Static analysis result for SHA-256 1665c1f8396de61b…

MALICIOUS

PDF

39.5 KB Created: 2020-08-31 01:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 780e51960e382cc493e52c3d8bc7bba7 SHA-1: 5ff4daba4f5afe818badc1192859de821addb16a SHA-256: 1665c1f8396de61b6097a04de5e82a3bbf88476d52fc0ea32754a01bffd6370e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.club/wix?keyword=planeaciones+de+computacion+primaria'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking URL, likely to mask the malicious intent.

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.club/wix?keyword=planeaciones+de+computacion+primaria
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/cambridge_checkpoint_english_coursebook_9_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/1359/3499/files/92165555061.pdf
    • https://cdn.shopify.com/s/files/1/0436/9616/0921/files/9016613373.pdf
    • https://cdn.shopify.com/s/files/1/0438/2962/4992/files/25960877013.pdf
    • https://cdn.shopify.com/s/files/1/0433/4891/8440/files/20437347732.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e8ed6ff45f241b4af717fcd1fba23be.pdf
    • https://static.usrfiles.com/ugd/b8c837_31ab62e2ed9c4746bce29bbd0a9a6965.pdf
    • https://static.usrfiles.com/ugd/5b9a87_b26ec69b2796427fa1f4682face838c6.pdf
    • https://static.usrfiles.com/ugd/ca300b_8c6b7f764c1b4df4bda787e294b4b2d6.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_off00005a40.bin
ce3541940d3adb0eba1c7e89f3f5ba4db4331e048c16ffd35c7751782808a67f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A40 5220 bytes
font_01_sfnt_off00006bdf.bin
737ca57fa33620c1d4e9c58adc56597348d272702da1faf6100e9a6666277d8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDF 11116 bytes

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