Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1caf886a8e81a0…

MALICIOUS

PDF

35.4 KB Created: 2020-09-02 01:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09a739e71f9bbd0fbe32e8438553801a SHA-1: b8c251fe7c14b5a9ed25e7b77645b1f504540061 SHA-256: 6b1caf886a8e81a0a5d899685002482533990c9e844e504699a1e939285e1ad2
194 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body and heuristics indicate a lure related to advance-fee scams, disguised as educational material. The presence of numerous external PDF links, many benign, suggests a link farm designed to obscure the malicious redirector.

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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.cc/wix?keyword=campbell+biology+10th+edition+solutions+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6201/8716/files/bhangra_dance_performance_in_school.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0044/files/balanced_cantilever_bridge_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dekafarisajanitid.pdf
    • https://cdn.shopify.com/s/files/1/0429/1962/4870/files/tixenolugip.pdf
    • https://static.usrfiles.com/ugd/b8c837_6902fd47bee947a9aeb8e43c9f1216b1.pdf
    • https://cdn.shopify.com/s/files/1/0448/4985/6669/files/basic_grammar_rules_for_writing.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/kawezeforakesajojenoxevon.pdf
    • https://cdn.shopify.com/s/files/1/0428/4245/6231/files/squinting_modifier.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/xunoboni.pdf
    • https://cdn.shopify.com/s/files/1/0430/9604/7783/files/catering_business_plan_from_home.pdf
    • https://cdn.shopify.com/s/files/1/0438/3784/9762/files/vizasodefas.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_off00004ae4.bin
150e2593cc0fa2e551016e63399cda351c8b04d94e7a0ec873089e5dd5fcfa62
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AE4 5616 bytes
font_01_sfnt_off00005dce.bin
d7dcd82b1edea43950b992e5980a96b8a40a261b72cfea826e5ec459c21e7857
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCE 10392 bytes