Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc0a1cae0dca060…

MALICIOUS

PDF

54.2 KB Created: 2020-07-27 06:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7cbc95b4a116ec446bbce90c86712f5 SHA-1: db2db1229e43b0ab4e8cfc2709fb19f55ba59e83 SHA-256: 2dc0a1cae0dca0609d189c33e9e7014d4b71cc507cbffe8863617eaa08782e54
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to advertising and the wkhtmltopdf tool, suggesting a lure. The primary malicious IOC is the ttraff.ru redirector, which likely serves as the initial entry point for further malicious activity.

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/pify?keyword=que+es+un+anuncio+publicitario+pdf
    • http://files.sweetpapercreations.com/uploads/1/3/1/4/131453252/e6c7daba1.pdf
    • http://files.elliottsmithdiscography.com/uploads/1/3/0/7/130739747/75493176c6f177.pdf
    • http://files.herrmanndj.com/uploads/1/3/1/4/131483219/zekomesoton_papuzebekufa_notesaj_mozomitixuxol.pdf
    • http://files.sjosephpsychotherapy.com/uploads/1/3/0/7/130740591/663039.pdf
    • http://files.sweetpapercreations.com/uploads/1/3/1/4/131453252/e6c7daba1
    • https://cdn.shopify.com/s/files/1/0431/6427/0743/files/68122204461.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/nefinuresinibi.pdf
    • https://cdn.shopify.com/s/files/1/0436/8151/3625/files/4276665169.pdf
    • https://cdn.shopify.com/s/files/1/0432/6693/2902/files/liniwo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/70374869602.pdf
    • https://cdn.shopify.com/s/files/1/0432/9573/5976/files/69955937005.pdf
    • https://cdn.shopify.com/s/files/1/0429/6946/4991/files/42181530871.pdf
    • https://cdn.shopify.com/s/files/1/0428/9966/9151/files/88238189205.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zejakepujubuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76588695657.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6268/files/39688630837.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9812/files/letalevodused.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/wufeputaxexike.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/75412157503.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_off0000916e.bin
c7ab38e331bd2985723e78d447db68248f9fef1f5201a66782c0d9bfc2a63406		 pdf-font-stream PDF embedded font (sfnt) at offset 0x916E 5232 bytes
font_01_sfnt_off0000a333.bin
bc6a4b4924f11a4fda2e01388006786f93d6363cdd6b413a36f78666fa871cc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA333 11896 bytes

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