Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab8bbb71fec2d25…

MALICIOUS

PDF

41.9 KB Created: 2020-09-12 15:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25ca9c108531f3b2ac2d6713ced8ebff SHA-1: 03bf907c20e4994737437216b046a1518cade1c4 SHA-256: bab8bbb71fec2d2511f0ad09a4cdec54ebf6419473fe061ba17f541c0941330b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'paper presentation format for project'. The primary malicious link identified is https://ttraff.me/wix?keyword=paper+presentation+format+for+project, which is likely used to redirect users to a malicious site or download further payloads. The presence of a link farm heuristic further supports the malicious intent of distributing links.

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.me/wix?keyword=paper+presentation+format+for+project
    • http://files.illinoissaxophonestudio.com/uploads/1/3/0/7/130775111/3318172.pdf
    • http://lajilufaf.pasadenapetshospital.com/uploads/1/3/1/6/131606490/kitamukujidewek-nizis-zijijipuso-notezi.pdf
    • http://suzev.csdola.org/uploads/1/3/1/4/131453247/vexexeras.pdf
    • http://files.mildredsfatburgers.com/uploads/1/3/0/8/130874526/sevuvizepufitufobi.pdf
    • https://static.usrfiles.com/ugd/4479ed_ef6746cbb9f74576b2e69ad12408131c.pdf
    • https://static.usrfiles.com/ugd/6846fe_f5731c7c476e4bba93a15a8b85b187d3.pdf
    • https://static.usrfiles.com/ugd/e66789_d6e0bf9d5bc24887977bbda10cfd561b.pdf
    • https://static.usrfiles.com/ugd/538d67_d2ca3a6d98cd4118ac89b77e73eafb34.pdf
    • https://static.usrfiles.com/ugd/5ad03d_c307d90aa33c4fdf8e8a532d6dfc75e8.pdf
    • https://static.usrfiles.com/ugd/67e251_eb7b35d3f6fc49e989f977d8e155ec21.pdf
    • https://static.usrfiles.com/ugd/b8c837_9bcc5f2c98884778aaea515996663cd5.pdf
    • https://static.usrfiles.com/ugd/d8e941_0b1dbbfa11214b089c7cdba896585d54.pdf
    • https://static.usrfiles.com/ugd/b65acf_86a2338ce177451fa9b3d961806948d8.pdf
    • https://static.usrfiles.com/ugd/c81504_3ec1409115a742db8ea4e46995724a66.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_off000066a3.bin
9bd80f927b9601c9abd168d7b2c265333d8ecdd54dd739c091b2a75d167e1a9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x66A3 5208 bytes
font_01_sfnt_off00007847.bin
66778716efc84aff3f7214e97c72bf72e834a95fa6d9a9f41f0900b5f29d0490
pdf-font-stream PDF embedded font (sfnt) at offset 0x7847 10128 bytes