Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa92c6f7c63e0fb…

MALICIOUS

PDF

43.0 KB Created: 2020-08-19 17:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60209b12fc6743609266be6ca026d826 SHA-1: a5af233fe8bd16ddca2d61468e5ff18a9388fd8a SHA-256: 7aa92c6f7c63e0fbf0fee8561f7d09416537ff52a771599136a9b2b8845d37d5
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'Android phones 2019 straight talk' and the malicious URL. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm designed to attract traffic, with at least one URL identified as a malicious redirector.

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.cc/pify?keyword=android+phones+2019+straight+talk
    • http://nazixabev.ravenswoodef.org/uploads/1/3/0/7/130776486/losafijigibegop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8460/1752/files/libertango_trumpet_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/apgenco_syllabus_for_eee_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/3502/3770/files/livunupakizu.pdf
    • https://cdn.shopify.com/s/files/1/0449/6090/7423/files/avian_influenza_oie.pdf
    • https://cdn.shopify.com/s/files/1/0433/5969/9109/files/gixer.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/91722421362.pdf
    • https://cdn.shopify.com/s/files/1/0431/5270/3645/files/iterate_object_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0433/5416/1310/files/aleksandr_solzhenitsyn_200_years_together.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/dead_island_developer_mods_location_guide.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_off000061fa.bin
15b008eea5d5fdf82dc3bd27ce84498fd86e5e0d26f9bf541b041b97b2aa00cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x61FA 5756 bytes
font_01_sfnt_off0000758b.bin
f28a5f1522190ac24c153dccb896ad6b3da59b07d83456a6160e41cf1ee2477d
pdf-font-stream PDF embedded font (sfnt) at offset 0x758B 13172 bytes