Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61a417a2b7bc60e…

MALICIOUS

PDF

41.9 KB Created: 2020-08-06 09:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e62f760214b38cccc2cf4b1400718d0d SHA-1: 85a3fb6b30d3588583d46dc0386a964c0b7d27e7 SHA-256: c61a417a2b7bc60e9103ad9f5b5b1fe3deaa2770ce5260502e8f9c4d9d69841a
154 Risk Score

Malware Insights

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

The PDF contains numerous links designed to appear as legitimate content but redirect to malicious infrastructure. Specifically, it links to a known malicious redirector at 'ttraff.ru' and also hosts a large number of PDFs on Shopify domains, likely as part of an SEO link farm to improve search engine ranking for malicious content. The ML classifier strongly indicates maliciousness.

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/wb?keyword=padi%20nitrox%20dive%20tables%20pdf
    • http://fubadile.singaporemartialarts.com/uploads/1/3/1/4/131407535/butubekuxifat.pdf
    • http://files.gladwinfmc.org/uploads/1/3/0/7/130738841/3175606.pdf
    • http://fagatusam.mommywhereismyshoe.com/uploads/1/3/0/8/130813834/kawik_sukak_lisunaforamam_vomovujuvu.pdf
    • http://files.jstarkdesign.com/uploads/1/3/1/8/131857305/mirabat_luguwejubuzut_derefamesitaro.pdf
    • http://files.salisburyroversfc.co.uk/uploads/1/3/1/1/131164125/8864407.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8954/files/pojuwizulegelopakuzoniz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/pigunidozudirenimaxiwuru.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/tipexowupuseponefawuduzow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zexula.pdf
    • https://cdn.shopify.com/s/files/1/0438/6557/1493/files/5758803044.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/kekovirewekewenuxudo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/955075526.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/wonuduvowo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/jobenusot.pdf
    • https://cdn.shopify.com/s/files/1/0430/5682/4471/files/pu_la_deshapande.pdf
    • https://cdn.shopify.com/s/files/1/0430/3064/2837/files/59760445986.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81858120772.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53940391871.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_off00006572.bin
81026806ec3f14fa7a8b266d89bc8c8cd6583bd56b519d942ae4495a22ecbe6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6572 5304 bytes
font_01_sfnt_off0000778e.bin
9af2f8c83851fdd0c455677be8c6947b285dfb128208f55b00f7373889690286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778E 10060 bytes

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