Malicious PDF — malware analysis report

Static analysis result for SHA-256 b918f529dc7a119a…

MALICIOUS

PDF

47.8 KB Created: 2020-08-30 06:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0fad0466e3b8df09da220ef6c8ea5f4 SHA-1: 916de053e0225b66cef81812b1b6a56438f9577b SHA-256: b918f529dc7a119a640dbb150e7ef8fb3d4ca36eb26edc3acf44ab7be76fe47d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.001 PowerShell

The PDF contains embedded links designed to redirect users to malicious infrastructure, specifically to `https://ttraff.ru/wix?keyword=acid+music+studio+9+free+download`. This is further supported by heuristics indicating a malicious redirector link and a PDF link farm. The document body, though heavily obfuscated, contains references to the lure and the redirector URL, suggesting a social engineering attempt to trick users into downloading potentially unwanted software or malware. No scripts were extracted from this sample.

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=acid+music+studio+9+free+download
    • https://cdn.shopify.com/s/files/1/0434/4630/4933/files/72476073031.pdf
    • https://cdn.shopify.com/s/files/1/0429/1792/0934/files/49101185607.pdf
    • https://cdn.shopify.com/s/files/1/0436/0326/3645/files/2010_cadillac_escalade_platinum_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/2582/3904/files/82032161961.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/45981353590.pdf
    • https://static.usrfiles.com/ugd/269bb8_83208d4a85814998b14bc54d45fb8adc.pdf
    • https://static.usrfiles.com/ugd/b8c837_5256334a210048ee94a97f102978c2ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_f09e7c95316f4fa48aca75a811768719.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc872e4f102c4b119147633d4be6625d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7450f0a71b8442cc90548803a306cbe0.pdf
    • https://static.usrfiles.com/ugd/4c1554_feec0c01bde14ab5944a627dbf04f8f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_e464a8a67a07489fa31bc7d8cdac3a0f.pdf
    • https://static.usrfiles.com/ugd/5af86b_a3fec2a0263547879c431c31dd126845.pdf
    • https://static.usrfiles.com/ugd/b8c837_86fd3b4a1b0e47df8cd87c2ef50731de.pdf
    • https://static.usrfiles.com/ugd/26938b_9d0ebd8b384b4d4490b6f43a91d1bc8b.pdf
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/addition_and_subtraction_of_rational_expressions.pdf
    • https://cdn.shopify.com/s/files/1/0440/8662/4406/files/pejum.pdf
    • https://cdn.shopify.com/s/files/1/0434/7009/4501/files/homeshop18_double_bedsheet_combo_offer.pdf
    • https://cdn.shopify.com/s/files/1/0433/8135/8759/files/git_how_do_host_website.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_off00007c57.bin
9cf549f91ff3607f984fd5cb4e7a082c8cb80c0f943397f137faa333c95354f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C57 5404 bytes
font_01_sfnt_off00008eac.bin
91a80c385ec73858c9026dd457ced29a4ac4f24c5652befd7fbe773ae2818154		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAC 10444 bytes

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