Malicious PDF — malware analysis report

Static analysis result for SHA-256 7824f4275a8fd074…

MALICIOUS

PDF

50.1 KB Created: 2020-08-06 21:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8873b77a50c67ba32aee5c0be29397cb SHA-1: 28b2242b3016ba4af0e4cfe825a42d5502d229ac SHA-256: 7824f4275a8fd0742b633993e90c5f7a7c52043cac4fd4ae7389554dfa081e13
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service designed to obscure the final malicious destination. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious content. The presence of a link to 'ttraff.ru' further supports the malicious intent, as this domain is flagged as a known malicious redirector.

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=acupuncture+points+combinations+pdf
    • http://files.beckerbelieveit.com/uploads/1/3/1/6/131606291/0707d0f6ffe.pdf
    • http://files.kennethzinkl.com/uploads/1/3/0/8/130873941/5560329.pdf
    • http://files.funktionalglassworks.com/uploads/1/3/1/4/131406295/31c9ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9937/4233/files/pasazibinegawo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/27172846003.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/49519918484.pdf
    • https://cdn.shopify.com/s/files/1/0433/9168/0666/files/26702366713.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/gisejanele.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.pdf
    • https://cdn.shopify.com/s/files/1/0437/6382/6849/files/71033963951.pdf
    • https://cdn.shopify.com/s/files/1/0430/3319/8745/files/72244912022.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54729765263.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65105912314.pdf
    • https://cdn.shopify.com/s/files/1/0437/2103/1832/files/xaxowijutefodeserux.pdf
    • https://cdn.shopify.com/s/files/1/0436/1607/5939/files/53301968125.pdf
    • https://cdn.shopify.com/s/files/1/0429/3980/9959/files/arterial_blood_gas_interpretation_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1607/files/57969803681.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_off0000862d.bin
ff51010cd30de83afc9f0e8bfd9de118149756d1d36a0106c8086ca1a25a93d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x862D 5396 bytes
font_01_sfnt_off00009870.bin
43725a1859270fee25589f248668c2f8b8b6e854b309b1f3fe83948b48399eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9870 10032 bytes

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