Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3527f749b34d815…

MALICIOUS

PDF

43.7 KB Created: 2020-08-14 11:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb27d3f80f52a5dedff97b95cd9488c1 SHA-1: 7571f731be34e77b0bb1163fdf3922a705b6e320 SHA-256: d3527f749b34d815f903930a268d4029be9c5db4d17d992ed6e61183ce3a0bcf
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.ru/wb?keyword=nowhere%20man%20aleksandar%20hemon%20pdf, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also includes the malicious redirector URL and several benign-looking Shopify URLs, suggesting a lure to disguise the malicious intent.

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/wb?keyword=nowhere%20man%20aleksandar%20hemon%20pdf
    • http://files.saublebeach.ca/uploads/1/3/1/3/131384173/fibole.pdf
    • http://files.regencyparkcary.com/uploads/1/3/1/4/131454270/8102637.pdf
    • http://files.kellytuckercreates.com/uploads/1/3/0/7/130775286/tosojifexaxemunib.pdf
    • http://pugaxos.jeweltreecoaching.com/uploads/1/3/1/3/131379698/menudup.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/lawarasesojijilubifu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1254/6975/files/62727108259.pdf
    • https://cdn.shopify.com/s/files/1/0433/6772/7269/files/florida_boat_bill_of_sale.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/12317189331.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/wisutokizog.pdf
    • https://cdn.shopify.com/s/files/1/0431/3638/5181/files/coordinate_geometry_parabola_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/52162399991.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/49903509191.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/8000/files/vutekurizaxope.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4336/files/publicity_and_public_relations_in_marketing.pdf
    • https://cdn.shopify.com/s/files/1/0439/9398/9278/files/yakkos_world_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/9458/0136/files/java_update_checker.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/
    • https://cdn.shopify.com/s/files/1/04

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d23.bin
bab6799359a6c244f4373b21af17475e0c2fedd20d0d67eed3565d41783ad666		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D23 5404 bytes
font_01_sfnt_off00007f6f.bin
4107babc98cbf4f53b0414cb5ec87375166d921cd3184019d0df9b2570ca4721		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6F 10040 bytes

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