Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4b6d76439af9b9…

MALICIOUS

PDF

59.6 KB Created: 2020-08-29 13:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5b7e7bfa46017493ec02ba2db670c51 SHA-1: a353ca8cf5149a856c10df50d0542fff818c5c9c SHA-256: 8a4b6d76439af9b9f918c04f4887c14e4f3d5b4f28320c559b05cc641312597f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is disguised as an infographic CV template. The document body also contains this URL. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on 'cdn.shopify.com'. The ML classifier strongly indicates maliciousness.

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=infographic+cv+template
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/95388557772.pdf
    • https://cdn.shopify.com/s/files/1/0436/8406/9526/files/33542386179.pdf
    • https://cdn.shopify.com/s/files/1/0435/4143/0440/files/tofavategi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/58445142281.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/basic_spoken_english_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0438/0088/7457/files/88564976873.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/zumajosaxetizoxiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9918/4551/files/richard_dawkins_the_ancestor_s_tale.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/dufugoba.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/35646196393.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/bahumathi_telugu_movie.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/vewikugosula.pdf
    • https://static.usrfiles.com/ugd/b8c837_7656779f324e42e1b8aa0d9c175873b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_93c20e3567df492a89092aca5e2fb675.pdf
    • https://static.usrfiles.com/ugd/93c935_d22ed10da00145a3b220da41eec20d52.pdf
    • https://static.usrfiles.com/ugd/b8c837_288914f264e44faca53a812c5ca2abdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_69b21ff665ae4c409e69a998991bc73a.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_off0000acf0.bin
cdf68057e50f40df85d0a63a60ae71019b71b3a8c305011cb5c3d9aebf96005d
pdf-font-stream PDF embedded font (sfnt) at offset 0xACF0 5248 bytes
font_01_sfnt_off0000beaa.bin
72559e232971fc3c84c5a9f87a851930028e57275c1986c3de82633aebea1bfe
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAA 10164 bytes