Malicious PDF — malware analysis report

Static analysis result for SHA-256 18904a9c00c9e80d…

MALICIOUS

PDF

38.5 KB Created: 2020-08-18 16:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a39958c76058843df9d2c5e4c69eb40 SHA-1: 87ff6cef47b40900a78ce870eeec8cef4b6b2ee0 SHA-256: 18904a9c00c9e80d4ddc641d7ebbad7b41282ad84cfcb74c73e062dccebd3681
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links but one points to potentially malicious infrastructure. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to disguise its true nature.

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=compound+sentences+worksheet+second+grade
    • http://biwakuget.palmassweettreats.com/uploads/1/3/1/4/131406437/170e8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/minecraft_world_seed_map.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/75042802710.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8765/files/inkscape_convert_to_svg.pdf
    • https://cdn.shopify.com/s/files/1/0439/0263/2104/files/characteristics_of_life_worksheet_answers_key.pdf
    • https://cdn.shopify.com/s/files/1/0450/4797/1990/files/definition_international_relations.pdf
    • https://cdn.shopify.com/s/files/1/0431/5077/0333/files/gilufuwawewofejowegaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3563/files/xejidazijevemesavigogo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3636/9318/files/88214950310.pdf
    • https://cdn.shopify.com/s/files/1/0435/6784/1443/files/zagefobixotogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/bajaj_finserv_emi_card_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b19.bin
c63729d94e0c9863c6cf1da9a33329c6aea3cd20fd87839838ecf570e97f7d53
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B19 5468 bytes
font_01_sfnt_off00005d97.bin
c721fb9e8958850729b63bc9bf3430d8ca3bcf45a965593a18a8339883dac529
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D97 9724 bytes
font_02_sfnt_off00007eda.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDA 4324 bytes