Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc99d48372e9a58…

MALICIOUS

PDF

35.9 KB Created: 2020-08-18 19:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 761bc9d323d888ec40ddf3082f459262 SHA-1: 3d90befda642f9128a632226d92c4d7121efa641 SHA-256: 7bc99d48372e9a589478c56325f7ca6eaa6fd6964f2d3719965e0b384782e94f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be related to online games, likely serving as a lure. The presence of numerous external PDF links suggests a link farm or redirection strategy to obscure the ultimate malicious destination.

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/pify?keyword=carrom+online+games
    • http://modop.angela-baschieri-photography.com/uploads/1/3/1/1/131164066/5cc58b0dad7c7.pdf
    • http://vesuf.schonestandardschnauzer.com/uploads/1/3/1/4/131408791/movomumodixe.pdf
    • http://files.chicagotrainingcenter.org/uploads/1/3/0/8/130813466/8ba01335891f.pdf
    • http://files.janeheyesart.com/uploads/1/3/1/3/131380236/ad062c0ee78c3ac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/weblogic_admin_interview_questions_and_answers_for_experienced.pdf
    • https://cdn.shopify.com/s/files/1/0439/1705/0008/files/67206115520.pdf
    • https://cdn.shopify.com/s/files/1/0438/3067/3565/files/40404665013.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7308/files/64620061079.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2520/files/daxexojevexavarig.pdf
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/76967229772.pdf
    • https://cdn.shopify.com/s/files/1/0438/9994/5112/files/chuyn_file_c_hnh_nh_sang_word.pdf
    • https://cdn.shopify.com/s/files/1/0430/8955/9705/files/the_causes_of_bantu_migration.pdf
    • https://cdn.shopify.com/s/files/1/0454/3532/2526/files/kesis.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_off000050f4.bin
6c1ca5a99dc2c9a0f1b3d458a29a858be51fbc6f07182859f499fdcfef15d6b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x50F4 4908 bytes
font_01_sfnt_off0000618d.bin
6d5628e8c81e1cba54d39c689e02c91df43fbb3f4b469e0392043739b74e6f63
pdf-font-stream PDF embedded font (sfnt) at offset 0x618D 9852 bytes