Malicious PDF — malware analysis report

Static analysis result for SHA-256 542935c7fd5b3b97…

MALICIOUS

PDF

36.9 KB Created: 2020-08-29 20:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9c928ec77ef720b4f28485738436bec SHA-1: a33c5033f45f743736f0977cd0aee16dd51469c4 SHA-256: 542935c7fd5b3b97213ef26d055f726f1e549134c857bfbf7ef7139035bfe84c
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One prominent link, 'https://ttraff.com/wix?keyword=girl+just+want+have+fun+mp3+song+download', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a lure for users to download content. The ML classifier strongly flagged this PDF as malicious.

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.com/wix?keyword=girl+just+want+have+fun+mp3+song+download
    • https://cdn.shopify.com/s/files/1/0439/2353/8088/files/dudowevumafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2470/files/84377696822.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/lmk_text_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0429/0091/4343/files/89933863260.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0011227a3bc4570887837fc02b034a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_4122a60ba22740319772efdb9658b1f8.pdf
    • https://static.usrfiles.com/ugd/67f5f7_ddc6fed045f445e6a2a457e87eb60b3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_d43b6ec7328043178df670c7166d41a8.pdf
    • https://static.usrfiles.com/ugd/374ce0_99f5bd84b204400bb24a7d8f749bf302.pdf
    • https://static.usrfiles.com/ugd/b8c837_afbbf7799a4b480da77fbf1ed771e870.pdf
    • https://static.usrfiles.com/ugd/b8c837_877179e9127044b5944510eb7fb2d58f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4aa6b03043540a28a1ca0aa45a52158.pdf
    • https://static.usrfiles.com/ugd/d43733_4bbe15da43724118b4acacfe291b4364.pdf
    • https://static.usrfiles.com/ugd/c0b427_0539f052a90a4c1ba29a99742019f5cb.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_off000043c6.bin
35e20b05b118adac3e2fe3877b3ae629c136e5d8fe5588860a632c1f9b4b2cb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x43C6 5760 bytes
font_01_sfnt_off00005751.bin
0836b592f177b8ae43cf404632d47a264f228cd686ca460396399d343eee8384
pdf-font-stream PDF embedded font (sfnt) at offset 0x5751 9692 bytes
font_02_sfnt_off0000785e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x785E 4324 bytes