Malicious PDF — malware analysis report

Static analysis result for SHA-256 9025cc7a8877b173…

MALICIOUS

PDF

43.2 KB Created: 2020-08-20 23:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc62559d5c35f48f785631ff1b795b44 SHA-1: 5ac0f9df648f429789be06c043b3e837706467de SHA-256: 9025cc7a8877b173289e1ba79df6d7518d461b5fc397fe27bab378f91e1b771e
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of SEO-optimized links, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting the document's primary purpose is to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=hollywood+adventure+full+movie
    • http://files.thecodicoyote.com/uploads/1/3/0/9/130969632/b3b7de201.pdf
    • https://cdn.shopify.com/s/files/1/0438/8497/0152/files/free_office_lease_agreement_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0431/4805/0583/files/bridges_of_madison_county_self_guided_tour.pdf
    • https://cdn.shopify.com/s/files/1/0436/4392/8726/files/mobefukopudivi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9190/1081/files/16429433122.pdf
    • https://cdn.shopify.com/s/files/1/0450/4682/5110/files/resignation_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0434/4224/1688/files/63577768970.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/fimalunolibuzefon.pdf
    • https://cdn.shopify.com/s/files/1/0435/5247/3243/files/95291707695.pdf
    • https://cdn.shopify.com/s/files/1/0444/3452/2279/files/poxekariguparokozo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/kunebinuxebemageruvo.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_off00006b91.bin
c7d5a2b917f2ff0285f1d8df9038578176388f3e32b63643b1a24bfac40e44e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B91 5088 bytes
font_01_sfnt_off00007ce7.bin
bbc46808ff11b23892012640dbd0f7d000e9ef52180894c7ce471fd9d06dcc5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE7 10292 bytes

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