Malicious PDF — malware analysis report

Static analysis result for SHA-256 c338fd4f4c718d64…

MALICIOUS

PDF

44.0 KB Created: 2020-08-29 21:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d96fc9635607dd93d7f10a32571b4df0 SHA-1: cfcda273138402bcbe39828d72c1e987dec9582f SHA-256: c338fd4f4c718d64a63925c0134091f086368485755c28df30b402dd202a2af4
152 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. Additionally, PDF_SEO_LINK_FARM indicates a large number of embedded links, many pointing to Shopify domains, likely as a camouflage or part of a link farm. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to funnel victims to a malicious site.

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/wix?keyword=confession+of+an+economic+hitman
    • https://cdn.shopify.com/s/files/1/0429/2460/5599/files/93293558203.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1958/files/84943284568.pdf
    • https://cdn.shopify.com/s/files/1/0431/8402/9854/files/31665742054.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/power_wheelchair_evaluation_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/2073/7950/files/44281334001.pdf
    • https://cdn.shopify.com/s/files/1/0429/6802/3194/files/26580847422.pdf
    • https://cdn.shopify.com/s/files/1/0436/2980/5726/files/98379061671.pdf
    • https://cdn.shopify.com/s/files/1/0461/6463/9896/files/bitekanemuxozonumububesa.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/dedogakojolugewivudo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/mdu_date_sheet_reappear_2018.pdf
    • https://cdn.shopify.com/s/files/1/0439/4660/6760/files/mo_creatures_mod_minecraft_pe.pdf
    • https://cdn.shopify.com/s/files/1/0429/5196/6873/files/87823893800.pdf
    • https://cdn.shopify.com/s/files/1/0433/6405/7247/files/tozefolizades.pdf
    • https://static.usrfiles.com/ugd/5bb01c_c81eca78699547dea776525015daa82e.pdf
    • https://static.usrfiles.com/ugd/74a852_faccbc9710dc448689dde90058584227.pdf
    • https://static.usrfiles.com/ugd/b8c837_66906439af90418b9afd88414fe53845.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_c9f44b40c3614f5a8a39f2a85172c91e.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_off00006d2e.bin
22d67bbef5c27d46c0200730d4d96567fda61447d5db08bd1f71f81e9173158d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2E 4896 bytes
font_01_sfnt_off00007db6.bin
dc3d075d22cf35570d368cdcb1b3177e89c9eb8b0a1b7882bcafc0bdbc6c7495		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB6 11420 bytes

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