Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bca978443d1a04b…

MALICIOUS

PDF

53.1 KB Created: 2020-08-24 08:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08d8efa4f186e656ec5c90fce8854332 SHA-1: 3d2fd300f18ca484768a0b3c4b54322417e4fcae SHA-256: 2bca978443d1a04b9667945f24bb375d7175401feb7baa4af32ac9662d906f09
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=assisted+dips+form'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the redirector URL, suggesting the primary intent is to direct users to malicious infrastructure.

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=assisted+dips+form
    • http://nobezan.royalqueendom.com/uploads/1/3/1/4/131453512/401ae3b2dda217.pdf
    • http://vagurawu.dianedailydose.com/uploads/1/3/1/0/131071258/e2bb8df.pdf
    • http://rilawon.shelbygulllaird.com/uploads/1/3/1/6/131606758/a4cef19198845b.pdf
    • http://files.hotelsinischia.com/uploads/1/3/0/7/130738779/4838d2fca.pdf
    • https://cdn.shopify.com/s/files/1/0429/9158/3391/files/discworld_collection.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/55419191276.pdf
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/flannelette_sheets_target.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5666/files/67361396328.pdf
    • https://cdn.shopify.com/s/files/1/0435/6957/8147/files/nubawatofike.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/85033454441.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/17590192550.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/rofex.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1692/files/zibetiduxeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/85341268742.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/taniseraguvifololesugom.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/69876040756.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_off00009521.bin
d1eac6b322b330ff12b494c32947750648cf4c1ae8b398df72335f81c2cfcbbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x9521 4936 bytes
font_01_sfnt_off0000a5d1.bin
a37b44cbc9d4dc8dfdcf922fe3ce08113c4d346782e4e9469616d724cf483477
pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D1 9852 bytes