Malicious PDF — malware analysis report

Static analysis result for SHA-256 61694032ad4c5038…

MALICIOUS

PDF

48.2 KB Created: 2020-08-05 17:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfbe894fc0f67664d58718c69047ed86 SHA-1: c140503ec0cea98747c70de66c4a399c963a1de1 SHA-256: 61694032ad4c5038cea40a088c134d3c33e80e4f8d50e5b0881fd6ddffdc54d0
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector URL, identified as malicious. It also features a 'download button' lure, suggesting a phishing or social engineering attempt to trick users into clicking the link. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm, likely for SEO manipulation or to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/wb?keyword=water%20worker%20tank%20manual
    • http://files.stseachnalls.ie/uploads/1/3/0/7/130775393/bd2936.pdf
    • http://files.businesswritingmasters.com/uploads/1/3/2/7/132712615/wizomaxezewodap.pdf
    • http://files.marktravels.net/uploads/1/3/0/7/130776518/1356217.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2707/1127/files/95294525891.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/english_grammar_beginner.pdf
    • https://cdn.shopify.com/s/files/1/0428/8780/7129/files/flatline_justin_bieber_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2715/files/purugefawebizus.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/84933615071.pdf
    • https://cdn.shopify.com/s/files/1/0430/1937/0659/files/wujox.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/58403612916.pdf
    • https://cdn.shopify.com/s/files/1/0437/7555/7793/files/kixezikugeto.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9020/files/7072248369.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/vagujowupemalazufoze.pdf
    • https://cdn.shopify.com/s/files/1/0436/9511/2347/files/vujusopigidodowut.pdf
    • https://cdn.shopify.com/s/files/1/0433/9394/1671/files/dojipujobago.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081c6.bin
920918ec0949adf13ede2e2bb8d49689068b869fd6b032ed5ff1b6ce30b65791		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C6 4824 bytes
font_01_sfnt_off00009231.bin
d2c517954e8e9fb53de95fe9520a7b89fa77cf2b90397bf9f609af9a190fce6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9231 10004 bytes

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