Malicious PDF — malware analysis report

Static analysis result for SHA-256 073dafce2773ab0d…

MALICIOUS

PDF

43.6 KB Created: 2020-07-30 20:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90cee211d3c513c651c3388265a46fae SHA-1: 52687675405f5273786eb6ca14bca53653da6500 SHA-256: 073dafce2773ab0d25ff319a99ab7ef3786cc18824f73e78d6693cc584f7b4d3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=holt+physics+textbook+teacher+edition+pdf
    • http://files.primopianostudios.com/uploads/1/3/1/4/131407549/3270410.pdf
    • http://files.srikrishnapools.com/uploads/1/3/0/7/130740165/2869752.pdf
    • http://files.markromangbooks.com/uploads/1/3/0/7/130776484/telilapamavupuviw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7863/1072/files/24100903785.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/4976379337.pdf
    • https://cdn.shopify.com/s/files/1/0432/7260/1766/files/bufovolexufanawisoto.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/buduj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9635/9580/files/44500105055.pdf
    • https://cdn.shopify.com/s/files/1/0432/0775/3888/files/12102744348.pdf
    • https://cdn.shopify.com/s/files/1/0429/6117/4684/files/6682733895.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/77673365153.pdf
    • https://cdn.shopify.com/s/files/1/0434/4306/0901/files/koxazitove.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/fovoxerapusep.pdf
    • https://cdn.shopify.com/s/files/1/0438/8156/2280/files/9342029482.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_off00006b67.bin
4c6f7ad078907818f51d6673c8c2cfb89a4f39e65f746e2e20da49d45b9d150f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B67 5364 bytes
font_01_sfnt_off00007d94.bin
9201e1105260f9b7f63b867396eafff7be46527e1c6a96dd0f00a5b27ddb133e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D94 10492 bytes

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