Malicious PDF — malware analysis report

Static analysis result for SHA-256 44125d71a204611e…

MALICIOUS

PDF

40.9 KB Created: 2020-08-30 07:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6271d2b46d90636925eca7daef2a449 SHA-1: 7cb10118a96dc124674ddb114bfceff96721506e SHA-256: 44125d71a204611e666fed3c7600dacac982142670a3bbd2d1bffeb07949b67c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=archivos+de+audio+a+texto'. This URL is likely intended to lead the user to malicious content. The document also contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm used for SEO poisoning or distributing malware. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector and the link farm structure suggests a phishing or malware distribution attempt.

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.cc/wix?keyword=archivos+de+audio+a+texto
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/vutetat.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/fomaxoxunepubibobemivowij.pdf
    • https://cdn.shopify.com/s/files/1/0437/0789/1863/files/fission_fusion_worksheet_nuclear_weapons.pdf
    • https://cdn.shopify.com/s/files/1/0430/6993/1673/files/jorukutix.pdf
    • https://cdn.shopify.com/s/files/1/0436/0821/1619/files/xubugunanukopuwewuzivaje.pdf
    • https://static.usrfiles.com/ugd/f96b02_33581ad699c2400faafcc588c2f6a21a.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a0b90329eae4c639336662e90f90bb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ca6f42af8504f15a09752679f7346c2.pdf
    • https://static.usrfiles.com/ugd/a382ee_e529febc688f49cc9f8fcb65aafeb8b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f6a4ec01ce2412d9d447d9b7fc740d1.pdf
    • https://static.usrfiles.com/ugd/599026_28c8f3822fdc427baaad7c3d2a322e69.pdf
    • https://static.usrfiles.com/ugd/1f2646_be695320c15e4ec992852e6e109e66d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_c984c48df95d4e6a9a68e1b456226d62.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f878df0ea8b4a448d5abcb9aa01e1cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1b6dd5e34a34c318935621fec93e880.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_off0000628a.bin
60b8feacb49f0fe0ea47ef500c5004a7c06a55041a8386325b909805194d3866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x628A 5112 bytes
font_01_sfnt_off000073e3.bin
9b9b7608cb2aae5eda64b8f68b02ec0a6ec52875ded1a9e0ab66b2af72a21196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E3 10208 bytes

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