Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe772cfdcc08fb0…

MALICIOUS

PDF

36.9 KB Created: 2020-08-30 01:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc4e6cdc1d600f326a5492e6e59661c1 SHA-1: 893c4982111eb4637db5b802593d8786be1d9121 SHA-256: 9fe772cfdcc08fb0cc36b515ce3d50a64ce72e2e68424e83b46b9a1efea9e5bf
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a high number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that matches the suspicious redirector. This indicates a likely attempt to lure users to malicious content through a link farm strategy.

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=guitar+effects+pedals+the+practical
    • https://static.usrfiles.com/ugd/e2f7e1_d1d110d9c06b41159122e8e669647106.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf840f32a4434f0f821d515fb9d5e80e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ead4e8c8306479ab4a774814528b582.pdf
    • https://static.usrfiles.com/ugd/e3c460_6471dc4f263d4b219f43f0f2731cd84c.pdf
    • https://static.usrfiles.com/ugd/857e61_1b78441c68764a93b032c769f2d7eee4.pdf
    • https://static.usrfiles.com/ugd/286fb8_6bc104bee6e14c1ba6298c83b7afb955.pdf
    • https://static.usrfiles.com/ugd/b8c837_23dd7b715ab249a2b673114dd8402614.pdf
    • https://static.usrfiles.com/ugd/0adedf_ebe0b08524e7471199e901563fefb139.pdf
    • https://static.usrfiles.com/ugd/b8c837_06a290a14c7b4918819c938994945933.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c27b2f29272466d99dc3253a7eca9cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_d34207c01fbf4fe7bd429f977bf8b467.pdf
    • https://static.usrfiles.com/ugd/d94ae5_fea42bca506141ada3b0bb34fbcd0963.pdf
    • https://static.usrfiles.com/ugd/dd4472_cf332bfe065244ebb13e080f05d8c12b.pdf
    • https://static.usrfiles.com/ugd/96768c_31eebd3c28d747b381c1589700e65323.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90675932679.pdf
    • https://cdn.shopify.com/s/files/1/0437/8086/6197/files/risodanomekizoronovi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9135/1969/files/free_online_hidden_objects_no_downloads.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_off00005180.bin
ff71409ffc6fd9e7142f5e728eaf89d70b11dbe86e202154ace90277ec336b3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5180 5272 bytes
font_01_sfnt_off0000636c.bin
88994c047418f1a88edc81995a836c9514248b16da6ff37f18ef11de5bd306a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x636C 10296 bytes