Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff35aae08951fcf…

MALICIOUS

PDF

70.5 KB Created: 2020-09-07 08:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 394bb53730dcf0a0035601413b24bebd SHA-1: 7cdbe4f0754b5f050be7a672e40a7ba563ec28ed SHA-256: 2ff35aae08951fcff7e6f84f35ebc8761346ceac56cedbd9e386a2c11e8a4726
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a farm of 24 other PDFs, suggesting a coordinated effort to distribute malicious content. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the ttraff.link redirector.

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.link/wix?keyword=chhatrapati+shivaji+maharaj+photos
    • https://cdn.shopify.com/s/files/1/0459/9051/0754/files/bulbulay_drama_mp4_video.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/11718635995.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/kosofoba.pdf
    • https://cdn.shopify.com/s/files/1/0428/3547/6636/files/formation_sap2000_v14.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/rulosufokov.pdf
    • https://cdn.shopify.com/s/files/1/0460/3723/7924/files/surviving_mars_shuttles.pdf
    • https://cdn.shopify.com/s/files/1/0451/8517/1607/files/speak_now_1_student_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5335/7985/files/68913791220.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/raxuvixufaduvafam.pdf
    • https://cdn.shopify.com/s/files/1/0433/8899/3703/files/database_systems_10th_edition.pdf
    • https://static.usrfiles.com/ugd/963627_6c56b4e89e8d4c3ea901b36f3031f0c2.pdf
    • https://static.usrfiles.com/ugd/1be480_9fb7f625257a4fa9858ec520dacf18fa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b33f.bin
1ab49ea40bc5698bc74269a3d0058be4ac881482eb0ae857ea99468d452121bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB33F 5068 bytes
font_01_sfnt_off0000c455.bin
1751c415f462cf3a5c01b7e2f8ae44dd81e58638909f83c2e3848adc1bb671af
pdf-font-stream PDF embedded font (sfnt) at offset 0xC455 16156 bytes
font_02_sfnt_off0000f637.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 16204 bytes