Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b805942794c025…

MALICIOUS

PDF

48.5 KB Created: 2020-09-01 01:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aaec797b32d25757979f4959b3982d8 SHA-1: b5f5db16a8356a079ab87f97f7225882753a679a SHA-256: 52b805942794c02512eee24ac3a258f4118bc068cffdff1b8ff806171457026d
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external PDF links, with the primary malicious link being 'https://ttraff.com/pify?keyword=bhojpuri+bhakti+song++tinyjuke'. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and URLs, reinforcing the malicious intent.

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/pify?keyword=bhojpuri+bhakti+song++tinyjuke
    • https://static.usrfiles.com/ugd/6924eb_989b5919ac13421492b03458a0a2aab5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c18c34ad10884e728dd5f90b0d3ff43b.pdf
    • https://static.usrfiles.com/ugd/b50c55_1f544eadbc7345a3bc54ce101337a1ea.pdf
    • https://static.usrfiles.com/ugd/39cb9d_0df80c8c47df4df7822bf23d65da6243.pdf
    • https://static.usrfiles.com/ugd/fb5067_e1ebabe1d3384fc780e1342f65e04fd6.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/nuvetobemupemejegulir.pdf
    • https://cdn.shopify.com/s/files/1/0465/5762/6518/files/44609654043.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/jafusununirozebabemeboja.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/zeruveboravu.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_9290bc757c2740f6a93794625991eb2e.pdf
    • https://static.usrfiles.com/ugd/43d598_eac28cdc61b34abe9064a8b12c62a1f3.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_off00005983.bin
6dfdcab46062fc711f32f62302eb573d8a7e3aca5bfd1c1f44731130b9930fff
pdf-font-stream PDF embedded font (sfnt) at offset 0x5983 5480 bytes
font_01_sfnt_off00006c2f.bin
c933a12f30a31a176dec80e75ebfa37141f5bfdc1b7799745eabb3dbde550782
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2F 14696 bytes
font_02_sfnt_off000099d0.bin
18e4cf2d1da242ef55edb575204b81e1db2072b3ab7d404fbdef94373611f81b
pdf-font-stream PDF embedded font (sfnt) at offset 0x99D0 7424 bytes