Malicious PDF — malware analysis report

Static analysis result for SHA-256 7798467033b6b1d1…

MALICIOUS

PDF

47.1 KB Created: 2020-08-19 16:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23f7e8ce31778b555f433d2dda5168e7 SHA-1: b686841b6c0233e692c67977766a21e7be8b359d SHA-256: 7798467033b6b1d144e32b1fa9a23a7f2d644a1cec64779df93fc61bef91945a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a critical redirector link pointing to `https://ttraff.com/pify?keyword=baf%25C3%25B6g+bayern+formblatt+3+online`. This indicates a likely attempt to lure users to malicious infrastructure, potentially for phishing or malware distribution. The presence of numerous PDF links, many hosted on Shopify, suggests a link farm used to obscure the final malicious destination. No scripts were extracted, but the embedded URLs and heuristic firings strongly suggest malicious intent.

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.com/pify?keyword=baf%25C3%25B6g+bayern+formblatt+3+online
    • http://files.iocsummerschoolexeter.org/uploads/1/3/0/7/130774990/zuzeverasasemizi.pdf
    • http://files.nativlevy.com/uploads/1/3/1/3/131378993/1146888.pdf
    • http://files.camp-timberlake.com/uploads/1/3/1/3/131379696/1072133.pdf
    • http://files.canyonfallsestates.org/uploads/1/3/0/9/130969151/8af2e8931.pdf
    • http://wunon.scnomsu.org/uploads/1/3/0/8/130814526/liwalabusuxux_biketepo_texazuwiv_mulolobuxuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9203/4211/files/vezazuzejid.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/marewaju.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/vagixuxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/78119620977.pdf
    • https://cdn.shopify.com/s/files/1/0431/3828/5725/files/jiluturexaroxufoxowu.pdf
    • https://cdn.shopify.com/s/files/1/0450/2352/7070/files/bargaining_for_advantage_richard_shell.pdf
    • https://cdn.shopify.com/s/files/1/0431/9808/7328/files/marizafotawosepon.pdf
    • https://cdn.shopify.com/s/files/1/0431/3491/0618/files/70016456056.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/77971468889.pdf
    • https://cdn.shopify.com/s/files/1/0429/7218/4732/files/59725204833.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_off0000763d.bin
55e3c4a651ee75a04182090cb3311f6e47797ce9c26d852aee2f89c6fef57ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763D 5504 bytes
font_01_sfnt_off000088b5.bin
7cfb7ace1f47dd15517d6458de0a28307af99de513c5c80cfabf471a6d64b9cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88B5 11348 bytes

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