Malicious PDF — malware analysis report

Static analysis result for SHA-256 1132a47890dce98f…

MALICIOUS

PDF

43.7 KB Created: 2020-08-06 01:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aacfbe524a1b5b53204dea52f022b0d4 SHA-1: 8be0848ad8018e0d8b76126ab5082af1f7b48f5d SHA-256: 1132a47890dce98f3d9733e0a89c01afdd4640b2033d861710764d58ebb0d6b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to funnel victims to malicious sites. The document body, though heavily obfuscated, contains the same URL and references 'teaching learning strategies pdf', suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm used to obscure the true malicious destination and potentially for SEO poisoning.

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=teaching+learning+strategies+pdf
    • http://files.sweetlife-blog.com/uploads/1/3/1/0/131070374/zobibimubipa-wivopomamelalev-xawivizader.pdf
    • http://files.gylrae.co.uk/uploads/1/3/0/7/130775084/fubivofi.pdf
    • http://files.madlyeclectic.com/uploads/1/3/0/8/130814902/9b545f3b4596d2d.pdf
    • http://files.tarabooth.com/uploads/1/3/2/8/132815791/zefawova.pdf
    • http://files.hallelujah-lighting.com/uploads/1/3/0/9/130969160/gefepolejenimel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/33792308134.pdf
    • https://cdn.shopify.com/s/files/1/0433/9063/2092/files/lutonunabiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5287/5424/files/selepejuw.pdf
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/jivijuneratofobasuzoxab.pdf
    • https://cdn.shopify.com/s/files/1/0429/9620/3679/files/kodekupinenis.pdf
    • https://cdn.shopify.com/s/files/1/0432/9652/2398/files/6049326364.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/98138716265.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/45497829035.pdf
    • https://cdn.shopify.com/s/files/1/0439/5627/3310/files/ansiedad_cronica.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6228/files/32110394702.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72619586694.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e20.bin
9396aa93db6fecb4eef9c749c9891c06e61b86373fc66da064887d4c59602693		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E20 5368 bytes
font_01_sfnt_off00008059.bin
b7f0610ca671ea90ab335831075a2913e020aabb9fb66806deb74e8bc1ffa45f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8059 9724 bytes

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