Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b235e518f742459…

MALICIOUS

PDF

40.0 KB Created: 2020-08-30 21:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b3906f96ad0681049a8065f67c61279 SHA-1: 62b19c97efdd7597ef8ec3cc497228a2d46300fa SHA-256: 9b235e518f74245909da8874e9cddebc8f14cd096189c9a382411aefd2954513
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a critical heuristic firing for a malicious redirector link. It also contains a large number of embedded links, characteristic of a link farm. The primary malicious URL identified is https://ttraff.ru/wix?keyword=c+h+advantage+pro+mat+cutter, which is likely used to redirect users to a phishing or malware distribution site. The document body contains garbled text but includes the suspicious URL and several Shopify URLs, some of which are confirmed benign.

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=c+h+advantage+pro+mat+cutter
    • https://cdn.shopify.com/s/files/1/0434/2480/9116/files/pestel_analysis_file.pdf
    • https://cdn.shopify.com/s/files/1/0445/4852/2143/files/asterix_comic_books.pdf
    • https://cdn.shopify.com/s/files/1/0428/5497/3606/files/gimelizokex.pdf
    • https://static.usrfiles.com/ugd/b8c837_d99d9feb1f144681b9db795ef12f9348.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5cf7038ba8e407aaeb3b2ee5859a905.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbb400a36ca84a078d6a91bcc7b9d5d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_2734c83abdf44af1a55532e2184037fa.pdf
    • https://static.usrfiles.com/ugd/078c79_f3f9466409934ae8b5285062cea0138e.pdf
    • https://static.usrfiles.com/ugd/15cd4d_92cd93bd2b8749fbaa56ae69ab918897.pdf
    • https://static.usrfiles.com/ugd/f4de5e_979f20f618ec40ad9d078f2fddb25494.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/fukiwifetesiwesuxupaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3773/6603/files/20552518177.pdf
    • https://cdn.shopify.com/s/files/1/0436/2846/2243/files/mathematics_standard_2_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7093/files/64523831996.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7493/files/71959558413.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_off00005b33.bin
e00bb1e7566f36593ae736fb4a4401d0915e09a97153eb1cd1811ed2b9b6b293
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B33 5244 bytes
font_01_sfnt_off00006ce1.bin
aadd54f35417392695ec7084ea586d074e39f78e0b5005eb6a801f72ceb637b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE1 11440 bytes