Malicious PDF — malware analysis report

Static analysis result for SHA-256 c664370356bac4e9…

MALICIOUS

PDF

42.8 KB Created: 2020-08-22 05:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ef9518591d2ed488f435996cb526bf1 SHA-1: 26c45b0308e102db8a4873b19c57101a62f395b5 SHA-256: c664370356bac4e9a45b6153196b21a0fa56eb2f67e4b0f0d0b945ec920596a3
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. One of the primary URLs, 'https://ttraff.ru/pify?keyword=rti+letter+format+in+marathi', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other URLs hosted on cdn.shopify.com, some of which are also linked within the PDF.

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=rti+letter+format+in+marathi
    • http://fidokep.anjulisherinmft.com/uploads/1/3/2/3/132302766/6643d73c.pdf
    • https://cdn.shopify.com/s/files/1/0447/1400/0538/files/clockworkmod_recovery_zip.pdf
    • https://cdn.shopify.com/s/files/1/0435/3448/3616/files/38174961735.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/mumamunuvosikobuvuzutuke.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6230/files/xamizije.pdf
    • https://cdn.shopify.com/s/files/1/0445/9141/5460/files/finovopasunozavuxejab.pdf
    • https://cdn.shopify.com/s/files/1/0440/8374/0822/files/92654742366.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8743/files/benim_hocam_tarih_test.pdf
    • https://cdn.shopify.com/s/files/1/0440/8950/7990/files/pdf_bhagavad_gita_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/sonolupu.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_off000054d2.bin
938fec5fdddd05c41119996d0707568fcc8d7c7953c5cf74efb057af5b921258
pdf-font-stream PDF embedded font (sfnt) at offset 0x54D2 4836 bytes
font_01_sfnt_off00006511.bin
0fdac3042f78bc34617e1f2c5e56131478add731f0f1783af2ca672d2cb9d0e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6511 10140 bytes
font_02_sfnt_off000087ff.bin
9e2362481615937bfabe1f2d5ba476ec7277591bb27e29267e7a25c644a45a97
pdf-font-stream PDF embedded font (sfnt) at offset 0x87FF 6536 bytes