Malicious PDF — malware analysis report

Static analysis result for SHA-256 455682434c02e176…

MALICIOUS

PDF

50.8 KB Created: 2020-08-23 18:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3b7be3493384573dcf941fb9fb3baab SHA-1: 4bed3e33bc2e87cd5be4e1bf14a8666ce8a25742 SHA-256: 455682434c02e176a019824f91c333cf63a925eea8a2ea8c33f395cc9131d147
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This indicates a link farm or SEO poisoning attack, designed to drive traffic to malicious sites. The ML classifier strongly supports the malicious nature of this PDF. The primary malicious IOC is the redirector URL.

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=eccv+2020+template
    • http://mezirawup.thepositiverail.com/uploads/1/3/1/3/131380181/079fbd03.pdf
    • http://ruvatuje.whfryer.com/uploads/1/3/1/3/131383648/sejek.pdf
    • https://cdn.shopify.com/s/files/1/0452/5893/2381/files/boundaries_mental_health.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62374455636.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/58715217441.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/alchimistul_paulo_coelho.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4283/files/sysprep_answer_file.pdf
    • https://cdn.shopify.com/s/files/1/0462/3453/4037/files/31093949441.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/76409976330.pdf
    • https://cdn.shopify.com/s/files/1/0437/0733/4810/files/kitatipufafosasutomedar.pdf
    • https://cdn.shopify.com/s/files/1/0431/2170/5124/files/koravovutopotadeza.pdf
    • https://cdn.shopify.com/s/files/1/0434/8366/0441/files/824823451.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_off00007f08.bin
91f3a74d859f8f2ad1febd8dd24a331de4d0f74fc3e5d45d444a6204c3eabe5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F08 5096 bytes
font_01_sfnt_off00009055.bin
3a189ddaef7adae5b7194117b3e4c64a6ee7c8c3a1097fd330f97186d5b6cf1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9055 14888 bytes

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