Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd5a4c04703b24a…

MALICIOUS

PDF

52.7 KB Created: 2020-08-31 06:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dca2ae3c66f4f3f9892a43cbc5f76584 SHA-1: 10116c6b724479f4888281b62c780df3971ea7f6 SHA-256: 2fd5a4c04703b24a0c4c2fbe9aa4e1e9781ce2c6a6789c425b89bd5e81abfac7
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.link'. This indicates the document is designed to lure users to a potentially harmful website. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility and traffic to the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=ewha+korean+textbook
    • https://cdn.shopify.com/s/files/1/0432/4058/7431/files/45154453730.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/jakopipepusujefa.pdf
    • https://cdn.shopify.com/s/files/1/0433/9898/7941/files/cub_cadet_st100_parts.pdf
    • https://cdn.shopify.com/s/files/1/0432/3393/5519/files/blurt_nickelodeon_movie.pdf
    • https://cdn.shopify.com/s/files/1/0434/0046/2501/files/56577534238.pdf
    • https://cdn.shopify.com/s/files/1/0465/4176/6814/files/harvest_moon_a_wonderful_life_cow_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/zolarafowubiwonoze.pdf
    • https://cdn.shopify.com/s/files/1/0437/7883/4586/files/pump_up_the_jam_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/assetto_corsa_competizione_codex.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d47cced563b4c91b7c6e1833c6d57c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a87f687bdf2490eb99592bc80839ab5.pdf
    • https://static.usrfiles.com/ugd/b8c837_e96e6d9c99754abbb5a9873e870e0959.pdf
    • https://static.usrfiles.com/ugd/b8c837_32f6563762d24f5e9b8764a9afd3a3ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_341ae77d9b094c64a0fc298cbc1c6414.pdf
    • https://static.usrfiles.com/ugd/81d6a4_98402f90795a406184c7f6de2d74fbf3.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d27.bin
4e0f52016d919a25af9924b2cd6e4b67fe2ff570fdc3c85610f18914f45f10f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D27 5980 bytes
font_01_sfnt_off00007178.bin
1070af1f554d656e3ea02fdde084bd3c3798dba5a458585710ada58384ce6772		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7178 4884 bytes
font_02_sfnt_off0000822b.bin
f875deb9359d59e1ad897a4c58b27110476d7d5974b076305f770e0383a117e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x822B 13876 bytes
font_03_sfnt_off0000adbd.bin
069f5cdcb972b33999f3dc18a3e5b847fc2aa024b7c5b45b4734cedf253a8e5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADBD 16376 bytes

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