Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97f942bfdfba7b0…

MALICIOUS

PDF

41.3 KB Created: 2020-08-30 18:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8bb13926b9100ca6da578e0a9d39ae4 SHA-1: e3fb010b3bee4f00083d2b4d96ba042bf2bb933c SHA-256: e97f942bfdfba7b052e0d5617e3152242c30a16de9e6759ab64a6c570bbd1623
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, a technique often used to create link farms for SEO manipulation or to host malicious redirects. One of the primary URLs, 'https://ttraff.ru/wix?keyword=taco+bell+mild+sauce+calories', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=taco+bell+mild+sauce+calories
    • https://cdn.shopify.com/s/files/1/0463/7864/7713/files/icd_10_code_for_pectus_excavatum_deformity.pdf
    • https://cdn.shopify.com/s/files/1/0437/4626/3201/files/agathiyar_padalgal.pdf
    • https://cdn.shopify.com/s/files/1/0430/9463/8749/files/magle_fnaf_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/fafumixidupo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3739/9960/files/11365950408.pdf
    • https://cdn.shopify.com/s/files/1/0428/8859/3571/files/jimevu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/arihant_encyclopedia_of_general_scie.pdf
    • https://cdn.shopify.com/s/files/1/0435/5670/0319/files/rojasudufukal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gopag.pdf
    • https://cdn.shopify.com/s/files/1/0433/5783/1326/files/ziwaxak.pdf
    • https://cdn.shopify.com/s/files/1/0440/7210/8197/files/ludiporolezakurujekile.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_off0000617e.bin
40bb210c1624e761fee550c0763d43203e724e15babfc78d932ea8c84653cf74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x617E 5176 bytes
font_01_sfnt_off000072f4.bin
3362fff558263705727e7fbb1e299304626043f11e42e8542e5d809a402ca4da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F4 11300 bytes

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