Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca99dda9488bc3a…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 14:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bedf4a4626ff5db16a8b17a285173c31 SHA-1: 1054c9106fdec01c57c96385ab208e8702f50065 SHA-256: 0ca99dda9488bc3a8a9c18c94b7161f1e1fbc4144cd23fcbb659b67ac29e9249
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass external link farm, with many links pointing to Shopify-hosted PDFs, likely to manipulate search engine results and lure unsuspecting users. One of the primary links directs to a known malicious redirector infrastructure, indicating a phishing or scam attempt. 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.com/wix?keyword=angularjs+generate+pdf+from+json
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/4017/7314/files/52119380733.pdf
    • https://cdn.shopify.com/s/files/1/0436/7125/7241/files/asthma_inhaler_technique.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5602/files/33380308037.pdf
    • https://cdn.shopify.com/s/files/1/0457/7371/7670/files/comments_on_primary_school_report_card.pdf
    • https://static.usrfiles.com/ugd/3649d2_7cb026dd0b5d434cb5f131001855d974.pdf
    • https://static.usrfiles.com/ugd/b8c837_9663a0bee9fb4ecd91efa10551a8c3b6.pdf
    • https://static.usrfiles.com/ugd/3ce946_1aafdc5cf23c408ab4000f24f817129a.pdf
    • https://static.usrfiles.com/ugd/0511f5_ade35e25d10d47c9852076183362ef60.pdf
    • https://static.usrfiles.com/ugd/b8c837_c07415cb6f844e31a99903a4f6f3421f.pdf
    • https://static.usrfiles.com/ugd/516793_1943cc4de1a34e808addb989bc10d3d4.pdf
    • https://static.usrfiles.com/ugd/1f5cef_aa3f5e1046374de29af22981eb6053ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_321509018dc64367ae7f55a15431404a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000578a.bin
bbfb4c3d9398274a8f2f3e745593e4efd2afe12b7cf0bc35c6affc27b1dcd6ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x578A 5260 bytes
font_01_sfnt_off0000695e.bin
c094bf6d0f72478bfb20ec5b32160b9dd51a5c11773050d4c354a07c47cfd3dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x695E 10864 bytes
font_02_sfnt_off00008e31.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E31 4324 bytes