Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa7a06abfe64db5…

MALICIOUS

PDF

40.6 KB Created: 2020-08-05 22:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58178dcc0fa8c7ab09bdc2d25f6e5561 SHA-1: b9867aaca093ae3865d0bffb07b0433b8d289c3c SHA-256: 6fa7a06abfe64db5955d7eafb3acfabf77ea00162eefb43b18d6aad72536ef1b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to Shopify-hosted PDFs, suggesting an SEO poisoning or link farm tactic. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=multiplying+binomials+worksheet+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF titles, reinforcing the lure.

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.ru/pify?keyword=multiplying+binomials+worksheet+pdf
    • http://files.palmassweettreats.com/uploads/1/3/0/8/130815137/8785530.pdf
    • http://files.agealive.org/uploads/1/3/0/7/130739892/6430228.pdf
    • http://files.rabbitcustom.com/uploads/1/3/0/9/130969904/nubujitawor.pdf
    • http://files.superiorauctions.net/uploads/1/3/1/1/131164446/vokewi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/1869/8400/files/analyzing_and_interpreting_scientific_data_pogil_answer.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3140/files/78648990707.pdf
    • https://cdn.shopify.com/s/files/1/0429/3486/1987/files/33370620047.pdf
    • https://cdn.shopify.com/s/files/1/0435/2986/3320/files/audyt_bezpieczestwa_informacji.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/15120448587.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/folizajebaredanevorulu.pdf
    • https://cdn.shopify.com/s/files/1/0443/8222/4550/files/danny_garcia_boxrec.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zipepatijexozuzazes.pdf
    • https://cdn.shopify.com/s/files/1/0440/1758/2230/files/17126601972.pdf
    • https://cdn.shopify.com/s/files/1/0431/8222/7617/files/43292030937.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/womebinatarefopiwonura.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_off00005068.bin
cb55225cef105cc613fed15075855c68c90c7ce2313a6344d2d88a945e437960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5068 5740 bytes
font_01_sfnt_off000063c9.bin
6729071a114b9663aba9532ce88de2f999168d4e005445d3f3beaf107a095e3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C9 10632 bytes
font_02_sfnt_off00008773.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8773 4324 bytes

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