Malicious PDF — malware analysis report

Static analysis result for SHA-256 a974d905ec8500e5…

MALICIOUS

PDF

40.7 KB Created: 2020-08-29 09:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d86fff8966d6191c9c15f43565b2654 SHA-1: 961aad5dc9206edec0ec5dfe4e4705186feb363c SHA-256: a974d905ec8500e54eb513a9fc2ceb2342ea542c6de2f34552c567ff491dd8f3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=uncommon+women+and+others'. Additionally, it features a large number of embedded links, many of which point to benign-looking PDF files on static.usrfiles.com and cdn.shopify.com. The ML classifier also strongly flagged this PDF as malicious. The presence of the malicious redirector suggests an attempt to lure the user to a harmful site, likely for phishing or malware distribution.

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.ru/wix?keyword=uncommon+women+and+others
    • https://static.usrfiles.com/ugd/b8c837_ea4791ef89ca4ce79789d26a538d9868.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1a357972d654b30a6875ce4de228798.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d242bff7d5f40cfa0bd56abaee3b691.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2ed47b51d8f4aab89b7306997f4a98c.pdf
    • https://cdn.shopify.com/s/files/1/0436/9635/7530/files/calculus_12_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/8674/0646/files/taziruvefonigujelovofuge.pdf
    • https://cdn.shopify.com/s/files/1/0450/9663/2472/files/ski_arlberg_piste_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fulefevizurosojasi.pdf
    • https://cdn.shopify.com/s/files/1/0461/1227/6644/files/google_docs_foldable_brochure_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/dikewosibuwizego.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/sawan_barse_tarse_dil_mp4_song.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbdb7c50413848b8ac4bedb6f42ab5d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c071499630f4da8a037e399882d5f86.pdf
    • https://static.usrfiles.com/ugd/b8c837_89017d5737fc4f12a15d72e05e51c31c.pdf
    • https://static.usrfiles.com/ugd/b8c837_db5137a3c7904d6e862e689d545f7115.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_off00006275.bin
f07c110079859994217244dda1b81a61ab130c3690b1735f427bdae5df5bb1d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6275 5232 bytes
font_01_sfnt_off00007417.bin
9ff507700969b96717ccee234d405729157d5265189f4fa35d40fd6388113fa2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7417 10068 bytes