Malicious PDF — malware analysis report

Static analysis result for SHA-256 dceadb5b5aac5539…

MALICIOUS

PDF

40.3 KB Created: 2020-08-29 00:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db9fd8af11f174f128e2e26fc449e111 SHA-1: 90d8414822706a2c957cf5a763d322664708e4a7 SHA-256: dceadb5b5aac5539f95e421a8c50a4bf1cce388722f9a1ecd2193dd19cecfdda
152 Risk Score

Malware Insights

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

This PDF document was identified as malicious due to its inclusion of a link to a known malicious redirector, ttraff.ru. The document also contains a large number of embedded links pointing to various PDF files hosted on static.usrfiles.com and cdn.shopify.com, suggesting a link farm or SEO poisoning attempt. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content or phishing pages.

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=volvo+penta+workshop+manual+d6
    • https://static.usrfiles.com/ugd/b8c837_acd4e2360e3442e3b86e781b90b26e2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c8ef90836e44f9cbfe21057f7cca750.pdf
    • https://static.usrfiles.com/ugd/b8c837_413166dd6e904ee78e3076911b2f31fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_6dd67fe05b064a9787b6cc2a7dcf6836.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a21550afb224f0e8007d37ec4b9f7d6.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/87253518887.pdf
    • https://cdn.shopify.com/s/files/1/0434/1399/5672/files/8450632373.pdf
    • https://cdn.shopify.com/s/files/1/0439/3802/1531/files/nitaxelosasekaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/0838/5439/files/33688039191.pdf
    • https://cdn.shopify.com/s/files/1/0435/9625/1304/files/nujasomezovoranupokeje.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2073b104cc74ced9fdaba9c8dc72939.pdf
    • https://static.usrfiles.com/ugd/b8c837_742f67efcec24757a8a14ef10945a063.pdf
    • https://static.usrfiles.com/ugd/b8c837_432c4d5cc2ed4671be651a03bfab536d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d89f4c1daefa4a51ba6be8fbc032956c.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b20d45d18b94ade923c547aeb79234d.pdf
    • https://cdn.shopify.com/s/files/1/0429/5563/6889/files/gotalisotexavexa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7873/8335/files/fonowidewixavuri.pdf
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/77095037795.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4044/files/1757610854.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_off00005bd1.bin
607f2ad37ef59c135ae8bb12944c91e003813f1518344ac5510f56a0019070d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD1 5536 bytes
font_01_sfnt_off00006e88.bin
370003747139f905482a7455e46eb013542339a15d05babb5f381febf31cd541		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E88 11208 bytes

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