Malicious PDF — malware analysis report

Static analysis result for SHA-256 7083d9b1368f4922…

MALICIOUS

PDF

43.0 KB Created: 2020-08-22 18:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 767bb6eaa485ed7daa3e351ac0c71bd1 SHA-1: 65076edb13f7f28395ce2ca78cf5d9f7f4d98f03 SHA-256: 7083d9b1368f4922870ede391ba67ab4f5588da5300966edbcb82b626a95bff1
154 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 `https://ttraff.ru/pify?keyword=kia+cerato+2013+user+manual+pdf`. This URL is embedded within the document body, disguised as a user manual link. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious content. While no scripts were extracted, the primary attack vector appears to be social engineering via a deceptive link.

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=kia+cerato+2013+user+manual+pdf
    • http://dupujo.carolinapca.org/uploads/1/3/0/7/130739098/wifijedow_sokibizewezuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1708/4833/files/73307377102.pdf
    • https://cdn.shopify.com/s/files/1/0431/7836/0987/files/43823458250.pdf
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/28715111443.pdf
    • https://cdn.shopify.com/s/files/1/0435/5099/8679/files/bhakti_movement_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7904/files/demeronuwilazula.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/screen_capture_software_free_for_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/34228603789.pdf
    • https://cdn.shopify.com/s/files/1/0427/7351/2359/files/70701681982.pdf
    • https://cdn.shopify.com/s/files/1/0428/3272/4124/files/86826489755.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_off00006244.bin
7a1fb4dd4c4e96f6bd2365a94d046381a19a3c726cc0c0572a7f651493a53c2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6244 5760 bytes
font_01_sfnt_off000075c6.bin
975a90fa6d6b385c960f84a47dac2aad866cf49e47a93defa338bd25a1b4aad7
pdf-font-stream PDF embedded font (sfnt) at offset 0x75C6 13504 bytes