Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b94fcb1f048f4b9…

MALICIOUS

PDF

56.0 KB Created: 2020-08-28 15:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eed4a38339a608db174c359e9bf43e20 SHA-1: 6aefc22d51ede96dcda3e0d4683412aee03cbc3f SHA-256: 9b94fcb1f048f4b92c6e8a6a341c1323de3b4bcefd5162d1872914a446e1776c
152 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to a malicious redirector, disguised as a service manual. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the malicious nature of the primary redirect URL. The ML classifier also strongly indicated maliciousness. The document body text, though garbled, contains keywords related to a service manual, supporting the lure. The primary IOC is the malicious redirector URL, which likely leads to further malicious content.

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.cc/pify?keyword=toyota+verso+service+manual+pdf
    • http://files.metaphysicsfirst.com/uploads/1/3/1/8/131871850/tiguwasalibosu.pdf
    • http://foxaw.eviealo.com/uploads/1/3/0/8/130814328/benozusozifuwozizepe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6631/8230/files/19144239122.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/95631195983.pdf
    • https://cdn.shopify.com/s/files/1/0433/6409/0006/files/xagawovufu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2348/2525/files/bratislava_tourist_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/mabarexepakakuse.pdf
    • https://cdn.shopify.com/s/files/1/0437/8119/3885/files/69499798970.pdf
    • https://cdn.shopify.com/s/files/1/0428/6906/3836/files/15945682939.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6340/files/79169655796.pdf
    • https://cdn.shopify.com/s/files/1/0434/0809/7445/files/45842632985.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/16140013253.pdf
    • https://cdn.shopify.com/s/files/1/0437/4301/9159/files/mnemonica_book.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_off00009225.bin
2dc44bbc83b1255fdb9c34f4626f1d440c448efe7a1ae3760273285325f312cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x9225 5412 bytes
font_01_sfnt_off0000a480.bin
11daf35105d734c78235eae5896b3cd9ef1352f5c8ee90a1005512b8a61cade3
pdf-font-stream PDF embedded font (sfnt) at offset 0xA480 15072 bytes