Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9dcd0dc2c5bc7d3…

MALICIOUS

PDF

51.8 KB Created: 2020-09-10 08:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e15aaac4140a8144719718954bccbcb9 SHA-1: 14b9d6701e4b9d2c385b7640f79a9c19d7e02768 SHA-256: c9dcd0dc2c5bc7d3d80469465085338ca9524dd594f9b2567e42167954fd460a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a potential SEO poisoning or link farm attack. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a specific user-facing lure beyond the presence of links.

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.link/wix?keyword=filmywap+south+movie+hd++2018
    • http://files.cbddepotshop.com/uploads/1/3/0/8/130813931/bukogilizewerin.pdf
    • http://files.thefortunatefew.net/uploads/1/3/1/6/131637055/018cf3959d8b03.pdf
    • http://files.griffithdentalsurgery.com/uploads/1/3/0/7/130739415/8856254.pdf
    • http://kijufux.nickwinter.co.uk/uploads/1/3/1/8/131871796/3887523.pdf
    • http://files.elizafleetwood.com/uploads/1/3/0/9/130969686/4984282.pdf
    • http://fijofa.hanisthegroomer.com/uploads/1/3/2/8/132814930/sekazigesekid.pdf
    • https://static.usrfiles.com/ugd/21b4a7_9c53fce0c93446e79371151ccbc54e6b.pdf
    • https://static.usrfiles.com/ugd/a4d998_2355e8d774ca4dcca682bf3fc6e88343.pdf
    • https://cdn.shopify.com/s/files/1/0438/2497/1936/files/zutororerikaxowuralo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/57947141096.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_off0000757b.bin
d9cdaa4199a851761517f3eb03859461b3b5788c67aabddb2cea85948a5a3da5
pdf-font-stream PDF embedded font (sfnt) at offset 0x757B 5832 bytes
font_01_sfnt_off00008953.bin
21a65db3dcfa4c61dfb243989d547b929b95bb2ae33f56d7e09fe03b64c625dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8953 10188 bytes
font_02_sfnt_off0000ac54.bin
b098da79dd067f31ba2c2b8c1c5e919600cd02ab140df2a372f8f699e4c507e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC54 16076 bytes