Malicious PDF — malware analysis report

Static analysis result for SHA-256 78690ca7993141b1…

MALICIOUS

PDF

41.1 KB Created: 2020-09-01 03:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac8295f678a94ed3fb7d4037353ac6d8 SHA-1: 0db5929fbf388f1886d784b90d119a2ef49409b7 SHA-256: 78690ca7993141b16a9f5ca7062a6ccfea352a5b7a1202493ac2442d3a46f269
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector infrastructure, indicating an attempt to lead the user to malicious content. It also features a large number of embedded links to other PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier 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=ajcc+cancer+staging+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3201/9097/files/date_sheet_of_10th_class_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/2470/1847/files/simone_de_beauvoir_english.pdf
    • https://cdn.shopify.com/s/files/1/0435/7337/9231/files/suvekunetoxugi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/xolopukulupiwugadisaxaw.pdf
    • https://cdn.shopify.com/s/files/1/0457/0349/5836/files/free_online_editable_cv_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1492/files/16213419106.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/tigorakenipoja.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3934/files/65458773753.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/birmingham_train_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/download_dictionary_english_spanish.pdf
    • https://static.usrfiles.com/ugd/b8c837_d01c2263745f421caa30d754d1a999cf.pdf
    • https://static.usrfiles.com/ugd/2e79a6_e82be92ade41460e830490a339a420b5.pdf
    • https://static.usrfiles.com/ugd/d2cc1f_f80fac230d214e1b84c318e416d79633.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_off0000632e.bin
be07a3abfccf4b170c0d8cc326bee14c3d8092139835655198a3c768a2336151
pdf-font-stream PDF embedded font (sfnt) at offset 0x632E 5184 bytes
font_01_sfnt_off000074c0.bin
f0f141c62a526135ee236b3912aa29f97d0ccb5f77a28e25c7abf0fa0d529822
pdf-font-stream PDF embedded font (sfnt) at offset 0x74C0 10224 bytes