Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f400cdb21a843bf…

MALICIOUS

PDF

40.0 KB Created: 2020-08-12 03:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4c3eff3a4e9c46077f77e4dd2fda3f0 SHA-1: df28ec1077b1f99a00944fb576af95373a700ce8 SHA-256: 5f400cdb21a843bf2f7ee0d6be436c4ec316f5e947cd8b6709ed96afe7a13e0c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One prominent link redirects to `ttraff.com`, a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to educational worksheets and the URL `https://ttraff.com/wb?keyword=adding%20and%20subtracting%20decimals%20worksheets%205th%20grade`, reinforcing the lure.

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/wb?keyword=adding%20and%20subtracting%20decimals%20worksheets%205th%20grade
    • http://files.livingroomworkoutclub.com/uploads/1/3/0/8/130873840/bezijuxavas_vepusuvarefe_moviwuj_kuvixalawulet.pdf
    • http://zekirataz.woodstockvolleyball.com/uploads/1/3/0/7/130775164/sagiwegoka.pdf
    • http://files.ecothomasdesigns.com/uploads/1/3/1/4/131452949/8720037.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0641/9367/files/jowofofoturulodib.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7626/files/29220254969.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8770/files/58817674222.pdf
    • https://cdn.shopify.com/s/files/1/0431/5545/6149/files/statistical_analysis_handbook_2020_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/90338920413.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4342/files/38520648363.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3439/files/rifojumotawome.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/case_study_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/remove_metadata_from_mac.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/najadobozogupeja.pdf
    • https://cdn.shopify.com/s/files/1/0439/2937/0779/files/43973658444.pdf
    • https://cdn.shopify.com/s/files/1/0447/5827/0101/files/robotics_mechanical_engineering.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_off00005d40.bin
1da0ebd7776f6e4da1973cfe2c183c77cc73a41221fb499169ecdbd4c27f21c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D40 5760 bytes
font_01_sfnt_off000070b6.bin
0c353e7f76185edb714555355af799085e645dc1931e510fd506c546ac88a1af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B6 10108 bytes

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