Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3f20dc11542d1f…

MALICIOUS

PDF

44.4 KB Created: 2020-07-29 18:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3c213d17f7f8374d04da70378e3cf2e SHA-1: 282a6cb8c7b4b05cc43074988d97b91b7bd4afe8 SHA-256: 8a3f20dc11542d1fa3ff4f6beff5c83b8d255f3c56237eea6b933e53c43c561c
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links points to a known malicious redirector, ttraff.ru, which likely serves as a gateway to further malicious content. The presence of a large link farm, including many Shopify-hosted PDFs, suggests an attempt to manipulate search engine results or distribute malicious files through seemingly benign platforms. No scripts were extracted from this sample.

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=apprendre+parler+fran%25C3%25A7ais+dialogue+pdf
    • http://files.1stophairshopgc.com/uploads/1/3/1/6/131607103/zobad.pdf
    • http://files.z-emotion.com/uploads/1/3/0/7/130740522/8261722.pdf
    • http://files.garymdawson.com/uploads/1/3/0/8/130813510/xilejen-lidasa-loxapu.pdf
    • http://files.cedarandsageonmain.com/uploads/1/3/1/8/131858044/navaga_vuvujeroj.pdf
    • http://files.friendsofottawanwr.org/uploads/1/3/0/8/130874326/8698069.pdf
    • http://files.garymdawson.com/uploads/1/3/0/8/130813510/xilejen-lidas
    • https://cdn.shopify.com/s/files/1/0428/2351/6323/files/91050180988.pdf
    • https://cdn.shopify.com/s/files/1/0437/3640/0037/files/35373121612.pdf
    • https://cdn.shopify.com/s/files/1/0430/4371/7274/files/62203872096.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/26659553050.pdf
    • https://cdn.shopify.com/s/files/1/0432/0234/7168/files/puleroraxifezuvowaturuze.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6340/files/bumimojabebufibubowupopa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/nagazinumekituvudadezafuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6886/6212/files/patojejobinuxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9522/8565/files/14827782708.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7207/files/49043061641.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/56408237228.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/xotuxapopobotuv.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_off00006bdf.bin
919b1a673ebf9b079235d2e728a7f2f5987a18beedf35f270a5709b57200189d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDF 5180 bytes
font_01_sfnt_off00007d85.bin
6adacaee360848dfd3aa0674dac8f4194836ab5ad8fc1fc40d4eeebcee3f14b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D85 11560 bytes

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