Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b9f55962b8dcc6…

MALICIOUS

PDF

47.7 KB Created: 2020-09-01 00:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1dd7ff893d70013c8d57d50a252dbc6 SHA-1: 30211c4f7f13d9a62dac48e2446f3fa1f3b0c208 SHA-256: e2b9f55962b8dcc6d1510a4acee6768cad5e930a66163f4e83772ac2d00d308c
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document about the 'Dowry prohibition act 1961 pdf in marathi'. The ML classifier strongly indicated maliciousness, and the PDF exhibits characteristics of a link farm designed to distribute malicious content. The primary IOC is the redirector URL, which likely leads to further stages of the attack.

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=dowry+prohibition+act+1961+pdf+in+marathi
    • https://static.usrfiles.com/ugd/c7a620_fa75090eb9b0415f94f2218f2b2c29b2.pdf
    • https://static.usrfiles.com/ugd/3649d2_9f44259862db44a1b91aa49a2079f3a9.pdf
    • https://static.usrfiles.com/ugd/a91264_b69a8be9c95245b8ae80460cb1143828.pdf
    • https://static.usrfiles.com/ugd/f14cf6_970fcf70dc1040dd8b7b500454c7c8a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3d2a1a2504d4d1ebb71b3d09e395610.pdf
    • https://cdn.shopify.com/s/files/1/0439/5044/0603/files/67389300937.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/avant_garde_theatre.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9830/files/kokalosibeguzadu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6904/5926/files/relative_clauses_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4567/files/36656715272.pdf
    • https://cdn.shopify.com/s/files/1/0429/8945/3473/files/audacity_find_clipping.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3895/files/wanurerowuta.pdf
    • https://cdn.shopify.com/s/files/1/0440/0224/6814/files/install_maven_mac_brew.pdf
    • https://cdn.shopify.com/s/files/1/0434/4106/2055/files/49225368926.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_off00007cf8.bin
8500fb48a0c513a38b020efd099a897f3b4fd24a27afb9e388f41ceede2446cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF8 5880 bytes
font_01_sfnt_off000090e8.bin
6f33ca3a6f93361af02cd27037feacfb0147d6899333884d878d61d0023647e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x90E8 9720 bytes