Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b26ebb7a53628a4…

MALICIOUS

PDF

43.2 KB Created: 2020-08-08 10:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f324b21da302b072e7b56923f0cafe9 SHA-1: b8273d6ec4446e9f28fe63289cc5473630a6c608 SHA-256: 8b26ebb7a53628a4a9b774a476625957dd917fdd79423dffe8a4e41c10754fbd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and contains numerous embedded links. One of these links, 'https://ttraff.cc/pify?keyword=biodiversity+conservation+pdf+file', points to known malicious redirector infrastructure. The document also features a large number of links to external PDF files hosted on Shopify, suggesting a link farm or SEO manipulation tactic. No scripts were extracted, and the document body is largely unreadable binary data.

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.cc/pify?keyword=biodiversity+conservation+pdf+file
    • http://rifaxiboj.pack84mv.org/uploads/1/3/1/6/131606349/nufonip.pdf
    • http://files.tigerhart.com/uploads/1/3/2/6/132695492/nipitojumu_tufaruweliwibuk_malevegemij_sosegulewe.pdf
    • http://files.bellafurworks.com/uploads/1/3/0/8/130874204/pewex.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/90281136683.pdf
    • https://cdn.shopify.com/s/files/1/0434/1900/9173/files/hybrid_and_alternative_fuel_vehicles_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/54658047081.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/zizutomoguku.pdf
    • https://cdn.shopify.com/s/files/1/0431/7121/7572/files/bajodikusekoregegotikiken.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/73881174532.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0736/files/41930879346.pdf
    • https://cdn.shopify.com/s/files/1/0432/6614/6472/files/tusolozazimodewixip.pdf
    • https://cdn.shopify.com/s/files/1/0433/2175/3758/files/12132539162.pdf
    • https://cdn.shopify.com/s/files/1/0436/1761/6034/files/moxadiziwiga.pdf
    • https://cdn.shopify.com/s/files/1/0428/2528/5791/files/70324581748.pdf
    • https://cdn.shopify.com/s/files/1/0428/4488/1059/files/90612691975.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7188/files/41403559150.pdf
    • https://cdn.shopify.com/s/files/1/0432/1171/8820/files/mufovi.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_off00006a22.bin
03862e96f93fc50220a0630243ce82fa8d6a63bb7c3e8270f6b86a37a42bc796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A22 5360 bytes
font_01_sfnt_off00007c81.bin
553d16c953a59b6841517ad5e774c59e400a82cdb58c59909b540007585e06e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C81 10260 bytes

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