Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6db4661f5080e7a…

MALICIOUS

PDF

47.7 KB Created: 2020-07-19 03:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 8d08f42ad9cc452b99e670a9cc5dbdf9 SHA-1: 66820413a78ef3dfc6613d0cef08e1663e9bdb66 SHA-256: c6db4661f5080e7a730b259806ee4f5d6aba980a33b6bb479dd5fc179b9accdc
194 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to downloading free books. The primary malicious URL identified is ttraff.cc, which is used to redirect users to potentially harmful content. The presence of numerous external links, many hosted on cdn.shopify.com, indicates a link farm strategy to improve search engine visibility for malicious content.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=download%20google%20books%20free%20pdf%20format In PDF document text
    • http://files.qksnd.com/uploads/1/3/1/3/131398194/7325071.pdfIn PDF document text
    • http://files.surrenderedheartsnm.com/uploads/1/3/1/4/131454523/valopew.pdfIn PDF document text
    • http://files.wc4s.org/uploads/1/3/2/6/132681307/6dbf9b7a40064dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/33891274548.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8202/3061/files/loxiworirurizam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/70890259767.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0228/1633/files/mepawagifelur.pdfIn PDF document text
    • https://tujozoxi.files.wordpress.com/2020/06/tagajunobotaxog.pdfIn PDF document text
    • https://gozinogix.files.wordpress.com/2020/07/96752319663.pdfIn PDF document text
    • https://jiwuvef.files.wordpress.com/2020/07/senupesuzaduwinu.pdfIn PDF document text
    • https://wesofiviku.files.wordpress.com/2020/07/naxowozakekulixoxosal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/tenefilik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lugapib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9284441163.pdf?v=1594212706In PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/nuzeluxuredilo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7764/8027/files/vosoxavewubovuba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9464/6689/files/4965050341.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E63 5396 bytes
SHA-256: a73066ff084e11d16940f7bb1beacb767e47fad5b9dc9b7a74363ae6cc7b1f7a
font_01_sfnt_off000080b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80B8 22000 bytes
SHA-256: 7c1e61b5cc3d086fbfb2e7624c567e901da5b97812b95d603d368545f5aa7f85

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