Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69dc9d0165dc0e4…

MALICIOUS

PDF

43.7 KB Created: 2020-08-31 08:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d24b059990c367748bbed9c45da9c25a SHA-1: 2a1baec95d2d869d14f43cd6ffa59aaed7bd6470 SHA-256: b69dc9d0165dc0e4b804a14815303646ed76e8b7e3e00d50908eebfe4170d507
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains numerous embedded links. One of these links, 'https://ttraff.ru/wix?keyword=pdf+karl+marx', points to known malicious redirector infrastructure. The presence of a large link farm suggests an attempt at SEO poisoning or directing users to malicious content.

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=pdf+karl+marx
    • https://cdn.shopify.com/s/files/1/0428/8079/4780/files/bayliner_ciera_2655_swim_platform.pdf
    • https://cdn.shopify.com/s/files/1/0436/0182/1859/files/46433593789.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/tarufuvudaxularafiri.pdf
    • https://cdn.shopify.com/s/files/1/0437/4124/9690/files/55086401703.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/ruxakeragazapoladufate.pdf
    • https://static.usrfiles.com/ugd/a4d998_f660897b56934408a90d38b63709fc75.pdf
    • https://static.usrfiles.com/ugd/87a178_b500d9765ec1405bbf90a8a0ddfbb6e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e31703808bf4874b7dd69aadd26b9a4.pdf
    • https://static.usrfiles.com/ugd/784815_ba6a434671c44a40bc40500205668c76.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8095/files/53566299760.pdf
    • https://cdn.shopify.com/s/files/1/0446/5927/7987/files/algebra_1_regents_august_2015_answers_jmap.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0021/files/passe_compose_etre_et_avoir_exercices.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74535711799.pdf
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/fitbit_flex_2_instruction_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/9446/4929/files/introducing_phonetics_and_phonology_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/overwatch_border_levels.pdf
    • https://cdn.shopify.com/s/files/1/0433/4646/0830/files/31411576126.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_off00006e52.bin
e43c1132c6367f669dd60e668b18a7d371420c51b34a2f56e48be24db396cc9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E52 5008 bytes
font_01_sfnt_off00007f4e.bin
a112331df67bb9d2cf91cc982602a2df7daf49d10cdaa2929367254f2b8722d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4E 10192 bytes

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