Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0fb88f46ef6f2b…

MALICIOUS

PDF

81.0 KB Created: 2020-08-29 14:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1aba6a2f5f35e66fceb42a776a462977 SHA-1: 35de62ce1db9f31b155025328e9c6c6f2ebf6e56 SHA-256: cb0fb88f46ef6f2b67f10f43bb34ab57d0c18438efd5ef392f07bbf04d96e385
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded link text suggest a lure related to "Ranma 1/2 episode 164 vf" to entice clicks. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

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/wix?keyword=ranma+1%252F2+episode+164+vf
    • https://cdn.shopify.com/s/files/1/0438/7821/9944/files/45036492495.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nosisuzamozozi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7591/1321/files/pomudawokebapufake.pdf
    • https://static.usrfiles.com/ugd/b8c837_17c8f6c4e40b4f0fa3f29c9311347c6c.pdf
    • https://cdn.shopify.com/s/files/1/0434/8428/3033/files/vovoludavelamunupisimexu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/supply_chain_management_project_for_mba.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1395/files/jerolakexuxubiton.pdf
    • https://cdn.shopify.com/s/files/1/0430/5374/4279/files/75672625888.pdf
    • https://cdn.shopify.com/s/files/1/0434/2621/8136/files/39848200444.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/batumeveroponanepofotiw.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
stream_003_off00007ec8.bin
f667b5ac0cd6d06211f6e8e93985a2cdb0a8f297f807c3eaad1714dc2d6d1a67
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7EC8 40156 bytes
font_01_sfnt_off0000f9c2.bin
ff04cf710db2e9c7573beba5cb689dd2c7bd2fa71c5b3bf28e9ab28838655b03
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 5588 bytes
font_02_sfnt_off00010cd2.bin
18bdde8500c9e57934270c62384586485116b5fa5dba0cfff8833096d09f7de9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 13664 bytes