Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3238379f555f07a…

MALICIOUS

PDF

56.9 KB Created: 2020-11-02 22:55:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 045835969df35debae6bc4a38333d714 SHA-1: 138c8461d9f9484489d332a597d6127cfe674204 SHA-256: e3238379f555f07a0ff96808a0f4a47bfaebfdfb795c7efbc65bd2f2a19aa334
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. The document body, though partially corrupted, contains text related to a 'tier list' and the malicious URL, suggesting a social engineering lure. The presence of numerous external PDF links further supports the SEO link farm heuristic.

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.link/123?keyword=updated+langrisser+mobile+tier+list
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/2813/5591/files/33209679749.pdf
    • https://cdn.shopify.com/s/files/1/0501/2874/8739/files/farubizilizoku.pdf
    • https://s3.amazonaws.com/janodojivi/woresenavizidosuzanuw.pdf
    • https://uploads.strikinglycdn.com/files/bb9be4ff-21bb-4e4f-a4c6-6120a382ee88/80205669890.pdf
    • https://cdn.shopify.com/s/files/1/0502/8161/1458/files/japan_phone_number_format.pdf
    • https://cdn.shopify.com/s/files/1/0504/6353/9377/files/lake_okeechobee_level.pdf
    • https://cdn.shopify.com/s/files/1/0499/2381/7623/files/keystone_first_medicaid_provider_manual.pdf
    • https://s3.amazonaws.com/kexamoxusinixu/birds_of_michigan_sounds.pdf
    • https://cdn.shopify.com/s/files/1/0496/4833/7059/files/vujanu.pdf
    • https://s3.amazonaws.com/zalomi/bojezolibomezotinosa.pdf
    • https://s3.amazonaws.com/sedimeraxufi/tinutozumowerubigojewojo.pdf
    • https://cdn.shopify.com/s/files/1/0483/5849/0275/files/property_damage_claim_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0482/2479/6829/files/roblox_retail_tycoon_guide.pdf
    • https://s3.amazonaws.com/rujabepifar/broncodilatadores_beta_2_agonistas.pdf
    • https://s3.amazonaws.com/henghuili-files2/taxuxexugofevewikaze.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009025.bin
e3fc8a2eed198ebfff0cce568e4010a92db66abb8ea9b8e9272e194121fe602f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9025 5196 bytes
font_01_sfnt_off0000a1ab.bin
104dce93d7273d1800427970359091e94612d600711a296ed01f7011c7c7fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1AB 11336 bytes
font_02_sfnt_off0000c845.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC845 4324 bytes

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