Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b457ccc6282ee85…

MALICIOUS

PDF

41.2 KB Created: 2020-08-30 22:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dab9861449398d834419712b5b3cdc45 SHA-1: 4567ec005ae7fcd68b8f65e663e7418c7bef70ea SHA-256: 3b457ccc6282ee85e976f053b6f80c199f9f0a51b86088246da38665eb4fbfd2
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains numerous embedded links. One of these links, 'https://ttraff.ru/wix?keyword=easy+peasy+learners', is identified as a known malicious redirector. The document also features a large number of external PDF links, suggesting a link farm or SEO abuse tactic. The presence of these malicious and suspicious links indicates an attempt to lure users to malicious infrastructure.

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=easy+peasy+learners
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fovurasavelibegesixaga.pdf
    • https://cdn.shopify.com/s/files/1/0429/9436/8663/files/52306898704.pdf
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/51529736622.pdf
    • https://cdn.shopify.com/s/files/1/0438/0655/6322/files/hurt_nin_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/4275/0114/files/arguably_essays_by_christopher_hitchens.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6be4d119454488385e544be8e0be150.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab181c78135d41809a4d3d37dd25602a.pdf
    • https://static.usrfiles.com/ugd/b8c837_61aa954e9a2c416e8cf530f4bbf5c2ce.pdf
    • https://static.usrfiles.com/ugd/0047a4_6119f75358654281b7f8399c8080ab25.pdf
    • https://static.usrfiles.com/ugd/a838c0_c309c424f3284e86899cef7cbdc0f826.pdf
    • https://static.usrfiles.com/ugd/73f3b0_a654cb687d0f4a758d5ed81e69dd598d.pdf
    • https://static.usrfiles.com/ugd/c5d40f_730bad5eefa94a20a5b41744fbad8a71.pdf
    • https://cdn.shopify.com/s/files/1/0431/3304/2839/files/jodisipagasomu.pdf
    • https://cdn.shopify.com/s/files/1/0443/2812/4572/files/xobedibigejijulogapigalu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/kaxakefi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0624/6557/files/77484939870.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7609/files/fopefedonutuximul.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_off00006580.bin
4c24b58dc350644ec6f93874b924a1f4d0fadef6f3207cc746fbd1f3282a8d8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6580 4872 bytes
font_01_sfnt_off0000762e.bin
30a441281ef7273081b9300b64ee6ed68081de7fdde2e8b1ed6563ec635245ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762E 10000 bytes

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