Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fcde487d42b5a9…

MALICIOUS

PDF

50.0 KB Created: 2020-08-02 05:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfc845d0dced26a430bcb145dda47b0e SHA-1: 3ad0a8fb8ba22bd44b5ad0add190a67143f721b3 SHA-256: 18fcde487d42b5a9444b15ecf84772018bc9107d244046a8edb4f727adb8fb45
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged as malicious due to a high number of embedded links, with one specifically identified as a malicious redirector. The document body contains garbled text but also includes the suspicious URL and numerous Shopify-hosted PDF links, suggesting a link farm or redirection scheme. The ML classifier strongly supports the malicious verdict.

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=jonathan+coulton+ikea
    • http://files.powermoves.org/uploads/1/3/2/8/132814166/togefawefasajevi.pdf
    • http://files.perseveranceandpotatoes.com/uploads/1/3/0/7/130776141/nanugedogalaxetepopo.pdf
    • http://files.mtmcce.org/uploads/1/3/0/7/130775462/vatupewubim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1979/6643/files/tinkers_construct_sword_modifiers.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/66257840965.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/90154324182.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1070/files/19006745782.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/rekikox.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3799/files/tofelonazizolipowudimoduf.pdf
    • https://cdn.shopify.com/s/files/1/0435/4090/6135/files/duvelofomufanibozifu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/46130477993.pdf
    • https://cdn.shopify.com/s/files/1/0429/9027/2675/files/49169467889.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6906/files/50787959879.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2636/files/ximivimoxopiraxawol.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000847a.bin
419246dc4e3734e563d9a8635d7c7b6fa5452dd8b272b8df0b5e1444709936a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x847A 4664 bytes
font_01_sfnt_off00009454.bin
e8c1c8d58d98f38de5b3f0ee1a2b9a2865e09578916af17989334de621c9706c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9454 11712 bytes