Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc3897db95220ff…

MALICIOUS

PDF

37.5 KB Created: 2020-08-07 15:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec6e8ad858b02ee90e9d65ad1066255d SHA-1: 3a591cff316968d90696d87adf2e72d3fad14800 SHA-256: cdc3897db95220ffbcf9ac05be8be62b5acab889770262e83c5a5645f9671133
154 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 PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the same URL, reinforcing its malicious intent. No scripts were extracted from this sample.

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=eduardo+galeano+el+libro+de+los+abrazos+descargar+pdf
    • http://files.primocelloceramics.com/uploads/1/3/0/8/130873822/nikenekipup.pdf
    • http://files.urlingfordchildcare.com/uploads/1/3/1/0/131070859/216161.pdf
    • http://dijoz.thequadstudio.com/uploads/1/3/1/6/131606490/9a22287cd8.pdf
    • http://files.jamztrainings.com/uploads/1/3/2/3/132303351/02c79e.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/convert_degree_to_radian.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/ford_f250_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/3516/2786/files/10421754925.pdf
    • https://cdn.shopify.com/s/files/1/0434/0088/8469/files/wilitidasefigijizituwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9958/6714/files/jitakimawimobomenereku.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/uninstall_java_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/libro_a_proposito_de_tu_boca.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pizegavegip.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/adachi_to_shimamura_light_novel.pdf
    • https://cdn.shopify.com/s/files/1/0433/2155/7150/files/99053281854.pdf
    • https://cdn.shopify.com/s/files/1/0429/5449/0012/files/74310237238.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/creative_brochure_design.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_off0000522b.bin
40bacef14d782af89f2a4afa3c481647302a650c574f22d7439a943bf68c2283		 pdf-font-stream PDF embedded font (sfnt) at offset 0x522B 5468 bytes
font_01_sfnt_off000064dd.bin
42cd2083e59735f3b94c0150cf98ee85a64fd9cd978a4c52304041dcafb8ac5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64DD 10972 bytes

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