Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cee8b5604d8d72…

MALICIOUS

PDF

45.4 KB Created: 2020-08-29 17:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 186a0d6d0dbec9bf64bca36c987ec0e2 SHA-1: 7ced752c79fe96003e8702a241a497b0a6d415bc SHA-256: b5cee8b5604d8d72b0a11ef3a8ec5e886a33692441dd5e4ae6921cf29b0b4f8b
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised as a parts manual. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many hosted on cdn.shopify.com, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=prentice+loader+parts+manual
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kumug.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2336/files/24016982761.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6650/files/hemostasis_journal.pdf
    • https://cdn.shopify.com/s/files/1/0434/6504/8229/files/kaplan_sat.pdf
    • https://cdn.shopify.com/s/files/1/0436/2970/7422/files/98426983542.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/murray_lawnmower_manual.pdf
    • https://static.usrfiles.com/ugd/c7a620_fce1a983da704cbfa1ee9e18702bddbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_bed7d6b9cb774ea09db2a37f335f53ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b60b0c50f844d458b006f84c3d5d206.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1c0bcdf44914913be75730a7deafb0c.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1986/files/stanley_trumpet_voluntary.pdf
    • https://cdn.shopify.com/s/files/1/0436/2282/6142/files/tiwifesitadizukizerurifa.pdf
    • https://cdn.shopify.com/s/files/1/0437/9426/8320/files/84923741605.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_off000062c4.bin
d4e495680de08edccdbc04b2928ad9ce3ad5e85942bf06c0ab5f7a179097f986
pdf-font-stream PDF embedded font (sfnt) at offset 0x62C4 5220 bytes
font_01_sfnt_off0000745d.bin
97e40eda96074e7e74432b3fe3646be0eabf63626d2534dbd8e3e18d4895ad07
pdf-font-stream PDF embedded font (sfnt) at offset 0x745D 17320 bytes