Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c99595b101ab1c…

MALICIOUS

PDF

47.8 KB Created: 2020-08-15 03:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcb4d7e8cf4498a8ee9982d0f46fed15 SHA-1: 7d030b7992872eb1399c52c8435ce6ce315e6290 SHA-256: 10c99595b101ab1cbbece15c52e6874945a6a545fbec487dbc9aabb62cf589f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, suggesting a phishing or scam attempt. No scripts were extracted, limiting the analysis of direct execution capabilities.

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=cash+book+format+for+housing+society
    • http://votesud.pulsefitnessmandan.com/uploads/1/3/0/8/130814310/9198440.pdf
    • http://files.modularis.co.uk/uploads/1/3/2/7/132710683/xirate-bexifag-betolaxefofov-ririkofaxon.pdf
    • http://files.moldingconfidentme.net/uploads/1/3/2/6/132695478/5638472.pdf
    • http://pixawed.shopamityvilleapothecary.com/uploads/1/3/1/4/131437402/2388486.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4977/0395/files/62420781972.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/making_a_play_abbi_glines_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9654/files/calendario_serie_b_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/sad_heart_broken_wallpaper.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/betemefamixiku.pdf
    • https://cdn.shopify.com/s/files/1/0439/0594/1672/files/sogezatom.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6378/files/tales_of_the_arabian_nights_book_of_tales.pdf
    • https://cdn.shopify.com/s/files/1/0437/4262/5953/files/digital_photography_school.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_off00007346.bin
b02debea27a2cf5da48d7e73113cd283ca464d4a2c7b5e7905d6495fba5da7bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7346 5476 bytes
font_01_sfnt_off000085cc.bin
af4c2ce224f927c9b9dad0c23ee00c24afd048f5a34571ce4bba48ce147842ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x85CC 14332 bytes