Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e78425a107daf2…

MALICIOUS

PDF

31.3 KB Created: 2020-08-24 13:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2518895d4fb8a2955da853f3a1a8bc8 SHA-1: 98657a9ada49e4b91b40f7a86c6abf2cbaad7443 SHA-256: 20e78425a107daf27edb83205b00c11a7e3493d068b176613bc63f475b2e219d
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify. One of these links, https://ttraff.com/pify?keyword=cognates+worksheet+answers, is identified as a known malicious redirector. This suggests a link farm or redirection attack designed to lead users to malicious content. 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=cognates+worksheet+answers
    • http://nojex.twoa-aawoa.org/uploads/1/3/1/3/131380600/lapid-kizuborovog-gifubedari.pdf
    • https://cdn.shopify.com/s/files/1/0438/5262/8118/files/eagles_philly_special_illegal_formation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fasexerogetotano.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4555/files/fozupazeripogupobagutodu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/marketing_strategy_of_coca_cola_and_pepsi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7718/0328/files/skf_rolling_bearing_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3929/files/los_organelos_celulares.pdf
    • https://cdn.shopify.com/s/files/1/0430/5177/8202/files/62395116612.pdf
    • https://cdn.shopify.com/s/files/1/0435/2317/8656/files/sekinapasukelizurusojof.pdf
    • https://cdn.shopify.com/s/files/1/0428/6378/8188/files/vuvisuwevobowoxo.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_off00003f41.bin
8ef6d4359c16707652a9f7b8d0cdc76bd3a7da6a2d14285bfffa6fb2cecfcf7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F41 4976 bytes
font_01_sfnt_off0000503f.bin
4a98702894baa8d985cc099246766af0d82b08f8d05ede0e80cc8903304acb78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x503F 9632 bytes

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