Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff8f48e8c0cfa13…

MALICIOUS

PDF

43.9 KB Created: 2020-08-16 12:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da3a19e25bbf5e576a4c24afb6bf5414 SHA-1: 399f0688457d64d4fbea07915a036c5fde5ad3ca SHA-256: 3ff8f48e8c0cfa13b9826d9121dae5bf1914920838854e6c75ae967bc46c3d35
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, identified as a PDF link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=tv+house+md+episode+guide', is flagged as a malicious redirector. The document body, though partially corrupted, contains text related to 'Tv house md episode guide', suggesting a lure to entice users to click on the malicious links. The ML classifier also strongly indicated 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.ru/pify?keyword=tv+house+md+episode+guide
    • http://files.violinstringreview.com/uploads/1/3/2/6/132682048/0df45a91506fbe.pdf
    • http://sodevu.positionlessbball.com/uploads/1/3/0/7/130740496/6757102.pdf
    • https://cdn.shopify.com/s/files/1/0428/3547/6636/files/72110530932.pdf
    • https://cdn.shopify.com/s/files/1/0428/3249/4751/files/9819332323.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4399/files/85294460683.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/astable_multivibrator_working.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/25157456724.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/39919039419.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/7724745040.pdf
    • https://cdn.shopify.com/s/files/1/0429/4184/1575/files/fokawu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/figilebi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8506/9477/files/73394477952.pdf
    • https://cdn.shopify.com/s/files/1/0428/5975/7734/files/nusevagubevuwu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sogogetuxupoxex.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/wubuf.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_off00006fd7.bin
7537937676bea06cd2bf0b4a5642128d5f85c903d92e0a3cc08e0afb773a041b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD7 5044 bytes
font_01_sfnt_off000080eb.bin
68f857727147a7af99c298c4d86682e773215c4ea046cfebab611fa8e3ff3bf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x80EB 10048 bytes