Malicious PDF — malware analysis report

Static analysis result for SHA-256 95cb7e3e0b5cc8e9…

MALICIOUS

PDF

42.5 KB Created: 2020-08-21 16:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d484aeeeb2fd535cdfdb647a4477bb85 SHA-1: 018d393785093a006f0e0558f4b14cbd93035b93 SHA-256: 95cb7e3e0b5cc8e9232d011d98c1b4f0e293cf27b5fff5dad1819bfc878f94f7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in

This PDF document contains a large number of embedded links, with the primary malicious link pointing to a redirector service at 'ttraff.ru'. This service likely obscures the ultimate malicious destination, which is a common tactic for distributing malware or phishing content. The presence of a link farm suggests an attempt to manipulate search engine results or distribute content widely. The ML classifier 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=seal+physical+training+guide
    • http://files.beyondnailartsupply.com/uploads/1/3/0/8/130874520/tosukasagen.pdf
    • http://files.capecodspeechlanguagepathologists.com/uploads/1/3/0/7/130740011/terel.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9079/files/93723709327.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/73505583841.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/89152318093.pdf
    • https://cdn.shopify.com/s/files/1/0435/8923/8943/files/freak_the_freak_out_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0448/7122/1410/files/libro_phillips_materiales_dentales.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/wejeludedototodirav.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4981/files/2279503757.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0181/files/tiwolitumilaxemikepi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7902/5318/files/c1_cambridge_exam_sample.pdf
    • https://cdn.shopify.com/s/files/1/0435/5407/8883/files/business_case_studies_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/5774/9917/files/felejuni.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28650507632.pdf
    • https://cdn.shopify.com/s/files/1/0439/8150/4670/files/37227802664.pdf
    • https://cdn.shopify.com/s/files/1/0440/2036/7510/files/current_affairs_july_2020_affairs_cloud.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_off000066f8.bin
6c0e29625d1ad0ffb893e3e142ba3ff2a2e2a1d64c4b33bf366fbf9ece62206e
pdf-font-stream PDF embedded font (sfnt) at offset 0x66F8 5540 bytes
font_01_sfnt_off000079b8.bin
1dc2ec888b8f26aae607e3f1728d49964b49654bb24f82151e578887aadc65d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x79B8 10392 bytes