Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9bddbc8cd98a42…

MALICIOUS

PDF

42.2 KB Created: 2020-08-08 00:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c70f32369324fa4506d5bafa0efc4577 SHA-1: ce6543a0aacd6957da1031428033295e7d055ba7 SHA-256: df9bddbc8cd98a42ef437bf69422bed398b83300ea1bee8b446aac2447ec892e
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to scholarship recommendations and the malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to lure victims. 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/pify?keyword=letter+of+recommendation+for+student+scholarship+pdf
    • http://files.fallentreeexhibitions.com/uploads/1/3/1/4/131406258/7727261.pdf
    • http://files.developass.com/uploads/1/3/1/3/131383483/9914529.pdf
    • http://files.kathleenlecoze.com/uploads/1/3/0/8/130813768/3418219.pdf
    • http://lufobaju.endlesssunsurf.com/uploads/1/3/1/3/131384401/7122643.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jakenetukuzalavat.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/icai_ca_foundation_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/gajekir.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/poland_zip_code.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/karexunabu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/72268706644.pdf
    • https://cdn.shopify.com/s/files/1/0430/4666/6389/files/songbird_fleetwood_mac_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/foundations_of_college_chemistry_15th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/wegutefaretatubagena.pdf
    • https://cdn.shopify.com/s/files/1/0431/6332/0471/files/nebabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4803/3689/files/wuverakofej.pdf
    • https://cdn.shopify.com/s/files/1/0429/0982/7231/files/gonojisularak.pdf
    • https://cdn.shopify.com/s/files/1/0437/6766/0706/files/sajonakijeral.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_off00006581.bin
4a193f2b0a56c6bfc34477959315dbc22df56c031157dd6a6d7bb096900ad5bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6581 5336 bytes
font_01_sfnt_off00007782.bin
d7481b8921a24fc520d624ff3dc8614d47632fb20575c3f53375c4204ef7681f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7782 10536 bytes

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