Malicious PDF — malware analysis report

Static analysis result for SHA-256 a882691e5c751275…

MALICIOUS

PDF

46.1 KB Created: 2020-07-22 23:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef8a7dbdfb44f14af78090772b5f610f SHA-1: d8c2749467aeb38e620216f78a2b7deb0ccc2f06 SHA-256: a882691e5c7512756c31de665969cd17ad27559c27a582085e27adf9364b7d46
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 pointing to Shopify domains, which is indicative of a link farm designed to manipulate search engine results or deceive users. One critical heuristic identified a link to a known malicious redirector, ttraff.com, further supporting the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=multiplication%20table%20sheets%20pdf
    • http://files.caryncoville.com/uploads/1/3/0/8/130873979/lagifupizulimel.pdf
    • http://files.kingdomdetail.com/uploads/1/3/0/7/130739621/e1e76.pdf
    • http://files.christinepr.co.uk/uploads/1/3/1/3/131380345/bopidetujigexerever.pdf
    • http://files.orderdipped.com/uploads/1/3/2/3/132302810/faxevewunux-kejiredinuriri-fasetebakusa.pdf
    • http://files.lifestyleofthebeliever.org/uploads/1/3/2/3/132303134/daxopeko.pdf
    • http://files.lifestyleofthebeliever.org/uploads/1/3/2/3
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/punibuvo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67572949107.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96672573922.pdf
    • https://rilasam.files.wordpress.com/2020/07/sozuja.pdf
    • https://pelakejabe.files.wordpress.com/2020/07/tenajerulabax.pdf
    • https://wakinaga.files.wordpress.com/2020/07/juvakivejivibijasoza.pdf
    • https://xokapuv.files.wordpress.com/2020/06/71845821240.pdf
    • https://suwifiwiru.files.wordpress.com/2020/07/dofitusodiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/4683/8176/files/90742323116.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6519/files/78355579636.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pagujusevidunevaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/nosafinug.pdf
    • https://cdn.shopify.com/s/files/1/0428/2341/8019/files/jofazazibutegozikofiwaka.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/7967709748.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/mejiwimulevusenewikebok.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/99594757674.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_off000076e7.bin
4e94d36ef5a12da1874cc32fec5d472efdc2110446427066dfc73bea3f063d91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E7 5176 bytes
font_01_sfnt_off00008873.bin
44763ea14df5db6431b85e5527f1f21cdac2b585d91b236b4fb4184dd7ba9429		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8873 10216 bytes

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