Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae41be93817033e6…

MALICIOUS

PDF

35.9 KB Created: 2020-08-08 05:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0e48275f40d943c6ccbe0eb2b692626 SHA-1: b67f80f98c8df9320dee31cd2635befb5791750c SHA-256: ae41be93817033e6d420a497a125d0c03b4c2cdf6ab2984042bd25b6a345c818
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=breves+cuentos+hispanos+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the redirector URL, suggesting its primary purpose is to lure users 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.cc/pify?keyword=breves+cuentos+hispanos+pdf
    • http://files.atlanticcoastproductions.com/uploads/1/3/1/8/131856331/rinudivaru.pdf
    • http://sakule.shadowsofutopia.com/uploads/1/3/1/0/131070374/4399669.pdf
    • http://files.civility-project.com/uploads/1/3/0/8/130873921/f701a7.pdf
    • http://files.firebaughffa.com/uploads/1/3/1/4/131406885/vugasipetidatebup.pdf
    • http://files.mythodicals.com/uploads/1/3/0/8/130814200/naxomuketolakoboru.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/kowivuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3834/files/48001715147.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/74191879438.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3639/files/metaphysical_bible_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9716/0866/files/90779279958.pdf
    • https://cdn.shopify.com/s/files/1/0427/4749/4567/files/2001_mitsubishi_montero_sport_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/2675/7270/files/soft_skills_notes.pdf
    • https://cdn.shopify.com/s/files/1/0443/4313/2316/files/barcos_que_vuelan_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0432/3069/1496/files/zobiraxotaguza.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6167/files/reduction_formula_integration_by_parts.pdf
    • https://cdn.shopify.com/s/files/1/0431/8432/4770/files/bizemu.pdf
    • https://cdn.shopify.com/s/files/1/0443/0381/0716/files/fundamentals_of_communication_systems_global.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_off00004c30.bin
d9e16ddb02343e45c652a3143db084b14feab3ddd5e5dafe230ad885cb235b55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C30 5320 bytes
font_01_sfnt_off00005e52.bin
a63a1a4de28f267d6684b26e21e79be5e086f0c8f48370b28c029f522c10ef78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E52 10716 bytes

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