Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a30c9a42d437896…

MALICIOUS

PDF

43.5 KB Created: 2020-08-06 18:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd7df3eccdf9f1484ffab4652eafcd0c SHA-1: fb6e68f96999e004c196abef7fc6e68ffc18d7c0 SHA-256: 1a30c9a42d43789690e6a6d3e8f159d821c0393d5441abb99f20319e04f3862a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with many links pointing to Shopify domains, likely to improve search engine ranking for malicious content. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body contains the URL https://ttraff.cc/pify?keyword=learn+basic+spanish+language+pdf, indicating the user is likely being lured to a malicious site under the guise of downloading a Spanish language PDF.

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=learn+basic+spanish+language+pdf
    • http://files.helptakeaction.com/uploads/1/3/2/6/132681938/3009213.pdf
    • http://files.prometheanpress.com/uploads/1/3/0/7/130776120/66b512d3b3937d5.pdf
    • http://pikino.well-builtcity.com/uploads/1/3/1/3/131380042/bivaruwizusiliniduma.pdf
    • http://files.soundmethoddjservice.com/uploads/1/3/1/3/131384171/3420729.pdf
    • http://kunefa.cleanwindows4you.com/uploads/1/3/2/3/132303189/tukefabug.pdf
    • https://cdn.shopify.com/s/files/1/0430/8857/6661/files/tigeradatux.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/24387572630.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81159011373.pdf
    • https://cdn.shopify.com/s/files/1/0432/4455/2354/files/botany_for_degree_students_algae.pdf
    • https://cdn.shopify.com/s/files/1/0428/4071/9516/files/doxiwebimosokuruximitos.pdf
    • https://cdn.shopify.com/s/files/1/0432/5372/7387/files/off_balance_sheet_definition.pdf
    • https://cdn.shopify.com/s/files/1/0434/3404/9703/files/18937749178.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/gorusamib.pdf
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/cool_math_games_spider_solitaire.pdf
    • https://cdn.shopify.com/s/files/1/0438/2189/1746/files/hill_climb_racing.pdf
    • https://cdn.shopify.com/s/files/1/0437/6798/8376/files/a_first_course_in_differential_equations.pdf
    • https://cdn.shopify.com/s/files/1/0432/3590/1602/files/dynamic_array_c.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c14.bin
a10d931665d425f47f1c53ceaa265f7ef9bcce3d1013c9644b89fb279963442f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C14 5496 bytes
font_01_sfnt_off00007ebd.bin
3dece90a10799e8f1a05106c079d9773b80a3e6400d2310aec4a1571129b3174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBD 10080 bytes

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