Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f6e4e7d00b015e…

MALICIOUS

PDF

56.1 KB Created: 2020-08-15 08:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2ae6b81dd23608977de218ebc53b1ba SHA-1: 9442b0f025b90b8a39aa409c6dcc59568e9ee2fc SHA-256: c0f6e4e7d00b015e211794c987e675e540b06b1e013d934d7fc2c8a06762b4da
152 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. Additionally, it contains a large number of external PDF links, many hosted on 'cdn.shopify.com', suggesting a link farm or SEO poisoning tactic. The ML classifier also assigned a very high probability of maliciousness. No scripts were extracted, but the presence of the malicious redirector and the link farm strongly indicate an attempt to drive traffic to malicious sites.

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.com/pify?keyword=biohazard+4+mobile
    • http://kerop.robinbetterley.com/uploads/1/3/0/8/130814328/309026.pdf
    • http://files.minneapoliselks44.org/uploads/1/3/1/4/131438046/5443283.pdf
    • http://files.lifeistooshortnottobeirie.com/uploads/1/3/1/3/131379706/garutosuzu.pdf
    • http://files.981themarcoislandfm.com/uploads/1/3/0/8/130813887/bfb4a736.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5611/files/salanokimumotiwis.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/free_hiragana_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/csuf_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/5732/2903/files/honda_gcv160_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/0701/6103/files/43199283697.pdf
    • https://cdn.shopify.com/s/files/1/0435/8357/0083/files/blank_brochure_templates.pdf
    • https://cdn.shopify.com/s/files/1/0450/8942/3525/files/ahmet_hamdi_tanpnar_saatleri_ayarlama_enstits.pdf
    • https://cdn.shopify.com/s/files/1/0434/0868/7269/files/doena_de_chagas_tratamento.pdf
    • https://cdn.shopify.com/s/files/1/0433/9017/3349/files/guidelines_acromegaly_management.pdf
    • https://cdn.shopify.com/s/files/1/0433/0094/6073/files/bodybuilding_gym_program.pdf
    • https://cdn.shopify.com/s/files/1/0435/9274/5117/files/20612112741.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
stream_004_off0000808b.bin
fd207cdf215d020271bf9efc0a22b40c99645a442f08effb06b6db7323e54faf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x808B 11072 bytes
font_00_sfnt_off00006ef3.bin
ac50ee5adbc8897cc19b54d9a2830d5e13caea0f9309dd940ec0f9b9be4680e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF3 5212 bytes
font_02_sfnt_off0000a039.bin
1720b0b947e5198150b904d62ce82f85eda1a2bbb28a4d8454deed59b1f060ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA039 15784 bytes

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