Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7acfa05a62161c5…

MALICIOUS

PDF

41.9 KB Created: 2020-08-31 00:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1907f34455708d07458589e4d1e7e908 SHA-1: 0a8ea110ce14b0559c00f27fd9707ccabe649f8e SHA-256: c7acfa05a62161c56142334dde76c27dd0d24f96559b7ad1a70c3cc97ba8d0cb
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 critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for '5e player's handbook 2 pdf'. The file also contains a large number of embedded links, many pointing to static.usrfiles.com, which is likely part of a link farm designed to obscure the ultimate malicious destination. The primary malicious IOC is the redirector URL.

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=5e+player%2527s+handbook+2+pdf
    • https://static.usrfiles.com/ugd/cc14e4_d44329f84ef0415c982275d1a6a7b4d9.pdf
    • https://static.usrfiles.com/ugd/5b9a87_13faa1bbc5b5413c8e55ee7002319e7f.pdf
    • https://static.usrfiles.com/ugd/5be868_c1f622ec825f475f942605a6ef011c31.pdf
    • https://static.usrfiles.com/ugd/7f929b_b42f546c38cd4634bf1c7e9fb5a6fdc2.pdf
    • https://static.usrfiles.com/ugd/b8c837_4622dc215d2e4f94b6f89ab7e5d0f771.pdf
    • https://static.usrfiles.com/ugd/4cf28d_71490b190e0443399b7dc3a139a7923d.pdf
    • https://static.usrfiles.com/ugd/b8c837_85e1aaeea572428bad9bc86ed7fca052.pdf
    • https://static.usrfiles.com/ugd/b8c837_0425a56518024801944dc1c0f3b7465b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3923e0aa6ad9414091d289212e171a52.pdf
    • https://static.usrfiles.com/ugd/de65f7_36544800e9e1405c9a75c30051d818dc.pdf
    • https://static.usrfiles.com/ugd/a64c8c_29a37a5bd351440d8341f658ce6ef9c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_a619a86bb2f6459bbfb4f97005104b68.pdf
    • https://static.usrfiles.com/ugd/6290de_63febd912d8949459dd3d4b8edf24e63.pdf
    • https://cdn.shopify.com/s/files/1/0430/1307/9203/files/69497031187.pdf
    • https://cdn.shopify.com/s/files/1/0438/0730/9986/files/acheron_sherrilyn_kenyon_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/what_is_ctrl_e_in_word.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_off0000639d.bin
6e1d25dba2f4cbb5a584a9a863a3c9a8e6de90250f937d23e97f809acbcbacf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x639D 5628 bytes
font_01_sfnt_off000076c9.bin
e20b2789df05b73dc142f0f70e241bc107de64c706855ae81bd43f80390094f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C9 10780 bytes

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