Malicious PDF — malware analysis report

Static analysis result for SHA-256 de310597afd0197d…

MALICIOUS

PDF

43.8 KB Created: 2020-08-03 11:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f40a021bb3158c9c00dfb9c51f14f6da SHA-1: 016e08cd61f23e40e105918f9bd2f3d7f4cdcdc9 SHA-256: de310597afd0197dc17f57b00b3264584baa8f587dfa13f328481884684dae05
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=similarities+and+differences+between+mitosis+and+meiosis+pdf'. This indicates the document's primary purpose is to redirect users to potentially harmful content. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO manipulation tactic to distribute the malicious redirector. 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.ru/pify?keyword=similarities+and+differences+between+mitosis+and+meiosis+pdf
    • http://files.michaelmillerpoet.com/uploads/1/3/0/7/130776607/7888496.pdf
    • http://files.dizzycoach.com/uploads/1/3/0/8/130874129/redesoba-xurun.pdf
    • http://files.violashe.com/uploads/1/3/1/4/131455463/vewuxilevejetiwew.pdf
    • http://files.whitezulubook.com/uploads/1/3/1/4/131409017/lakuzo_rerobagojolu_tutamipegadup_tunip.pdf
    • http://files.inspirewholesomeliving.com/uploads/1/3/0/7/130775085/wijix.pdf
    • https://cdn.shopify.com/s/files/1/0431/8189/9944/files/widuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/0085/5706/files/xibedazotuzemoxezeku.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2755/files/63094258926.pdf
    • https://cdn.shopify.com/s/files/1/0440/4844/9686/files/giguxarinopidata.pdf
    • https://cdn.shopify.com/s/files/1/0430/4293/0842/files/semalekujasuziket.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/6483654426.pdf
    • https://cdn.shopify.com/s/files/1/0437/8198/0321/files/2006_honda_accord_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/3134057883.pdf
    • https://cdn.shopify.com/s/files/1/0430/5007/4269/files/54440767492.pdf
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/xokow.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_off00006b58.bin
62893d2aacd23dee60130e42df4dd145da789df6ee1b9e06cd51a7a9739542bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B58 5636 bytes
font_01_sfnt_off00007e77.bin
06bf66efe3052f927ebf7767c0195477d9982237514af06883926c1a8c9aeb8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E77 10340 bytes