Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1337f50a1dfdea…

MALICIOUS

PDF

60.5 KB Created: 2020-08-30 16:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21e89afbf232aba0ec0ba4d0607d73e8 SHA-1: ca1c9e36035e45d1d90e18aa30e8dce0a79ff15f SHA-256: bf1337f50a1dfdea4b5a6969c907684646306b4cc49131ecc142c08862de9499
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to lure users to external sites. The primary malicious activity observed is the redirection to potentially harmful content via these links.

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/wix?keyword=carbon+copy+cloner+alternative
    • https://static.usrfiles.com/ugd/b56239_925d7002486b446e854573d929a231ed.pdf
    • https://static.usrfiles.com/ugd/1f5cef_02f92db325de464bb02c229edb1db211.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe395d96b34e427b99ff24739d37e4a8.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/8338809742.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/building_blocks_games.pdf
    • https://cdn.shopify.com/s/files/1/0435/3749/8276/files/xowakobozadixowokumavig.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a0647911b0d47e5a14ad61988378200.pdf
    • https://static.usrfiles.com/ugd/c7a620_f31d3ab15d154226a945de502ab19ab9.pdf
    • https://static.usrfiles.com/ugd/bf650e_b9ea4216ac8644bf8a0884c81a7d4525.pdf
    • https://static.usrfiles.com/ugd/7dd30d_6ada9f06af63435b813d4583a8f681ab.pdf
    • https://static.usrfiles.com/ugd/a44510_afef3895ce2145faa59a0bcd1d3790d5.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5965/files/pugujojejobubifupefobe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7367/files/50748991978.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/93234490286.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_off0000a184.bin
ec6e0175df3d035cc120c5a860549b90914de55a6ee72c7477ff6a14dbe96699
pdf-font-stream PDF embedded font (sfnt) at offset 0xA184 4864 bytes
font_01_sfnt_off0000b21d.bin
b8232c1f8a01c9ff784a29bd3466fc0a9639d30b53d949857a9a61a9e12c2d98
pdf-font-stream PDF embedded font (sfnt) at offset 0xB21D 10768 bytes
font_02_sfnt_off0000d6a0.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 4324 bytes