Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af64c57afa916ea…

MALICIOUS

PDF

32.3 KB Created: 2020-08-22 08:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6231f63a22b05156f7fb1c13e983bb0c SHA-1: e5e26a5ff60910f62c8236fa3d5cf656797ef0ef SHA-256: 0af64c57afa916eaef84ecbdc83720679604298ea8d66ebef5b0e4655127a7e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL is https://ttraff.ru/pify?keyword=template+banner+corel+draw+gratis, which is presented as a free template download. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a SEO poisoning or link farm attack.

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=template+banner+corel+draw+gratis
    • http://files.txtorches.com/uploads/1/3/0/7/130739169/ba61e090309ce.pdf
    • http://files.acupunctureworksvt.com/uploads/1/3/1/6/131637482/6974442.pdf
    • http://rovoxelig.splashsteamboat.org/uploads/1/3/1/4/131453526/fipesoja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4439/7468/files/piwawedizugotajujogo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8474/9729/files/rerujovapur.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/27977249144.pdf
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/zuwapupuzezazegaxodakamak.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/catalytic_reactions.pdf
    • https://cdn.shopify.com/s/files/1/0438/5318/5174/files/29889581973.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8526/files/vofexuvobiriw.pdf
    • https://cdn.shopify.com/s/files/1/0430/6590/1210/files/gemoxobexisafuzonabok.pdf
    • https://cdn.shopify.com/s/files/1/0436/1096/4131/files/vedenojonixa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6189/4565/files/85191398617.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89832202682.pdf
    • https://cdn.shopify.com/s/files/1/0435/4365/8650/files/pixide.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/4620949585.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.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_off00004597.bin
7f67fd1b4da81693ab5adfa7a9b664d52d5e79009945720dc066560dab726769		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4597 5572 bytes
font_01_sfnt_off00005871.bin
9c3f2f511542965bace5b5c6745e4f4fcae90a425b2516ccb36e7657723ad52e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5871 8148 bytes

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