Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf017ed26f951d97…

MALICIOUS

PDF

54.2 KB Created: 2020-08-04 08:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17a9f99e4749c2810b0f0b96f683056a SHA-1: efc408579d6fb63e3961a7069b1e90884c676601 SHA-256: cf017ed26f951d977fb253f403795cd4db214faeb7f2a1c5ecb12c50e4680a84
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) known for malicious activity. The document body, though heavily obfuscated, contains references to the redirector URL and other URLs hosted on Shopify, suggesting a link farm or redirection scheme. 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/pify?keyword=compelling+conversations+pdf+free
    • http://files.phruksathaispa.co/uploads/1/3/1/3/131383318/6429912.pdf
    • http://files.kcpanhel.com/uploads/1/3/2/8/132815961/1055807.pdf
    • http://files.sandracohn.com/uploads/1/3/1/4/131453950/3764528.pdf
    • http://files.creativefooddrive.com/uploads/1/3/2/7/132740327/4483967.pdf
    • https://cdn.shopify.com/s/files/1/0435/3998/8648/files/40731647022.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/tulumamufetaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/6245/9544/files/15115408112.pdf
    • https://cdn.shopify.com/s/files/1/0437/5740/4318/files/43805980004.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rosetotirumeza.pdf
    • https://cdn.shopify.com/s/files/1/0429/7906/6009/files/86021658640.pdf
    • https://cdn.shopify.com/s/files/1/0434/2556/2791/files/25697573442.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/93478654732.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5923/files/92259228581.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/les_mis_characters.pdf
    • https://cdn.shopify.com/s/files/1/0434/4876/2529/files/first_agricultural_revolution_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/zinamujebapokizisunivaf.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_off00008568.bin
f49eb4e5f6eada1da6c14dcdce39ada2586fcc27ab816423220264731239d017		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8568 5344 bytes
font_01_sfnt_off00009784.bin
0d55dc49e94487370bbc325790265afecb5ff37b4ae77e32eb488c95398b029a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9784 11280 bytes
font_02_sfnt_off0000bdba.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBA 4324 bytes

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