Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f494f153a5b84d…

MALICIOUS

PDF

54.0 KB Created: 2020-08-30 15:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0817d1b342c3ea8b15b37639467da513 SHA-1: c12a30521249c56a88dfe16d7e48111bc83b1228 SHA-256: f4f494f153a5b84d18b8c46d543cad00f9a61229ce948bb4116b5993f3d2ad12
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links directs to a known malicious redirector, ttraff.cc, which likely serves to obscure the ultimate malicious destination. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains the malicious URL.

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.cc/wix?keyword=mira+rainbow+six
    • https://static.usrfiles.com/ugd/b8c837_ef9c58fd780d47ad954c7516dc40384f.pdf
    • https://static.usrfiles.com/ugd/0789d5_f513d2cf2f1f4f2aad21713f034e52b2.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_29ae356276d549868efc2ddafb13a141.pdf
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/nivewijovexedugixifisuxim.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1336/files/stay_lyrics_rihanna.pdf
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/67539077090.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/1916970868.pdf
    • https://cdn.shopify.com/s/files/1/0429/5717/6986/files/jogelapapetipawudizeno.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94229011204.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/lobem.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/feborovijamewanoxujiguv.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/audio_arabic_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/2768/4760/files/4885629163.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5519/files/c._elegans_as_a_model_organism.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_off0000967f.bin
f3d9429d03b58cd7fde4e38c016e5e8cb44fad3d63e1cc010388bd80bd64a0a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x967F 4952 bytes
font_01_sfnt_off0000a77c.bin
102161827963b5f19ef81b28cc48ec53dd9e73c41270a5dbc9bfb69641925304
pdf-font-stream PDF embedded font (sfnt) at offset 0xA77C 10468 bytes