Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6537deab152a51…

MALICIOUS

PDF

53.0 KB Created: 2020-09-01 00:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07cb55bd3f5086b79f7f0438dde49dc7 SHA-1: 6b19ae98b2378f9f7081311fa20d9d986e545bc0 SHA-256: de6537deab152a5172fd9848ebee9fd34e123931064a51b99a60132ae8d8e1cd
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to host phishing content or distribute malware. The document body, though heavily obfuscated, contains the same URL and a reference to a 'joining report after leave format', suggesting a social engineering pretext. The presence of a large number of external PDF links, many pointing to static.usrfiles.com, indicates a link farm strategy, potentially to improve SEO for malicious content or to obscure the final destination.

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=joining+report+after+leave+format
    • https://static.usrfiles.com/ugd/b8c837_032545bc579f4844a2adcab88841ae67.pdf
    • https://static.usrfiles.com/ugd/de02f3_3d59a67ceba74c118b3e3ee8c4649af2.pdf
    • https://static.usrfiles.com/ugd/3649d2_05c8cf20a9a44703980d9c2f56555b78.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c88fd91eb284196bf4a88e69f2587c6.pdf
    • https://cdn.shopify.com/s/files/1/0434/3952/1958/files/2566740277.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/discord_link_text.pdf
    • https://static.usrfiles.com/ugd/d1c05f_815156cb8be0480b9822d4e2bb5a0d87.pdf
    • https://static.usrfiles.com/ugd/eed56f_e6f4c687c8b9473db1c00205d80ac07f.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_1bedaf1e1a354abd99d3496903cc4db1.pdf
    • https://static.usrfiles.com/ugd/05301a_2ac1dd37ceb944b29140cc1a18c5764f.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_f2573ff2b526451199d1aeecfb1c6d5a.pdf
    • https://static.usrfiles.com/ugd/0286dd_056649c0360743d888e010a5753bb691.pdf
    • https://static.usrfiles.com/ugd/b8c837_013be2fdc21c4e9b97afb638a87075e5.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_off00007491.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7491 6744 bytes
font_01_sfnt_off00008578.bin
f7990a3e728b90e1a7aab4fd71ef67d601329941d3ae3212bfc658dcac1a7468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8578 4880 bytes
font_02_sfnt_off000095fb.bin
ff4f9603367f4580a2cf451236c9c2f756eb656497738e479a68a30a4def39a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95FB 9980 bytes
font_03_sfnt_off0000b817.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB817 4324 bytes

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