Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b270737350a6888…

MALICIOUS

PDF

32.9 KB Created: 2020-08-05 04:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19c9f07bfd0b2b8a90953339a3bf5898 SHA-1: fdb2af4462689c6fe302ab86e5871e45a756a346 SHA-256: 5b270737350a688864c8b67143380f82b4926f1ecb2dab2a1d7d65d3ae6ab2a4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, a common tactic for SEO link farms and redirecting users to malicious sites. One such link, ttraff.ru, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'business process improvement toolbox PDF' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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=business+process+improvement+toolbox+second+edition+pdf
    • http://xanixa.shop1021.com/uploads/1/3/2/7/132710780/tuzupebuliwefupoz.pdf
    • http://files.chino77thcavalry.com/uploads/1/3/2/7/132740545/busiva-xifebojetata-vidugazukijelu-madifodezit.pdf
    • http://files.scalelive.com/uploads/1/3/2/6/132682070/dilofuvumagofo_xovogi_lajibo.pdf
    • http://fibopinu.delaneydiamond.com/uploads/1/3/0/7/130776487/46492ce0bd6.pdf
    • http://files.thefutureofindiana.org/uploads/1/3/0/8/130815058/7854339.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1204/6491/files/98454773611.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/norojakibi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/7494499460.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuxopikuxoxixu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4317/6091/files/jvc_everio_soft.pdf
    • https://cdn.shopify.com/s/files/1/0437/2591/4277/files/xukoxexoxeradaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3799/files/povuwiniretatejaxodogibor.pdf
    • https://cdn.shopify.com/s/files/1/0434/5276/0224/files/nimusogenebani.pdf
    • https://cdn.shopify.com/s/files/1/0434/6154/2054/files/wunopamipidawukuruwup.pdf
    • https://cdn.shopify.com/s/files/1/0428/7492/9319/files/rujikusijudobu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5802/6903/files/meluzekudevagafuxibasilo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3944/files/mccance_pathophysiology_7th_edition.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_off000046ee.bin
5c50e3f65d06c876a1c85471c64698184bbd2696a40177e00d2a59c055533f04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46EE 5408 bytes
font_01_sfnt_off00005945.bin
3028c6854218da799df182ac03396b78ddb2c0a3f8cd5d5a879e08ae41a1271e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5945 8508 bytes

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