Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fe43ca00a1a3ff…

MALICIOUS

PDF

66.1 KB Created: 2020-08-29 04:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efe3746fbe219797178344fd692fad4c SHA-1: 2cbf19ce54fcf6df9591484e044af30d51015017 SHA-256: 28fe43ca00a1a3ffd9fee9e01aeb959a29e1dbccf4f8a7072ea82ec217fe2946
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, characteristic of a link farm. One of these links, https://ttraff.cc/wix?keyword=japanese+basketball+league+salaries, points to a known malicious redirector. This suggests the document's primary purpose is to lure users to malicious websites through a deceptive link.

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=japanese+basketball+league+salaries
    • https://static.usrfiles.com/ugd/b8c837_411ac86cb72845088f6f82335e195277.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa4956cd0a6c44faac8d2f66fbb55a3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_223a44e38b0d4f0a895ad0371784530b.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd1a8274c51f454a8fef573f351975b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5e335ad9f584d23ad44099f41e18809.pdf
    • https://static.usrfiles.com/ugd/b8c837_99223cab84a5456c9afdc6adb5b0ca2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_da61417200a94ceba3db15df1b75b394.pdf
    • https://static.usrfiles.com/ugd/b8c837_57c057b2746b41f7ba7e3c347a6deb32.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f625cbcf4794ec5883a050d4165a7bc.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/77932802357.pdf
    • https://cdn.shopify.com/s/files/1/0434/7153/6290/files/ignou_assignment_front_page_file.pdf
    • https://cdn.shopify.com/s/files/1/0435/5869/9159/files/29103531399.pdf
    • https://cdn.shopify.com/s/files/1/0439/4339/5483/files/76581524612.pdf
    • https://static.usrfiles.com/ugd/b8c837_df531d34307749408b6e1046aa681173.pdf
    • https://static.usrfiles.com/ugd/b8c837_9874a02a9dda4bfd9f9a8b08fcd52cab.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae0e9126a33546a8a2ba2eddea92654a.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c9e7bc990b54eb38cbcd8e135731d45.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d5b.bin
718bc3a4a131d538d07c66b3a987511cf89fcd1e1513c115c850622ad45a4014		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5B 17476 bytes
font_01_sfnt_off0000c5d1.bin
c9d4f991ff354b17d35912303269841e907dcad16fa90ed6f46d663c129e9eb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D1 5180 bytes
font_02_sfnt_off0000d779.bin
5f9a317b2017bb7c1962f4bc2b5f953ff277f9a584b6f4469b71acb9144a7e1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 10224 bytes

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