Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf16d82fa32b778…

MALICIOUS

PDF

41.5 KB Created: 2020-10-25 04:30:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dce7f335126a641552507d3975144f9f SHA-1: e053d0ff1cb1b8bb6512d19cdfceea4ab8686cde SHA-256: 5cf16d82fa32b7781962405e93838025f761583775418d050149e457677e34f9
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link farm designed to appear as a free download for 'geometry dash', redirecting to malicious infrastructure at `https://ttraff.link/123?keyword=como+tener+geometry+dash+gratis+para+android`. This indicates a phishing or scam attempt, likely leveraging a PDF exploit to deliver a secondary payload. The ML classifier strongly supports the malicious verdict.

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.link/123?keyword=como+tener+geometry+dash+gratis+para+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f9154c66bf70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5f8ea2f1ad870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5f89df75cb9a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384469/normal_5f943cd3ca441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5f920ecc685c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_5f8a59cadff9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_5f87ac9b0a8bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_5f9359237a66d.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/natorisa-zowed.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/5116290.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/dcedadf33.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/1/0502/4258/4760/files/12520076453.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0344/3862/files/acticoat_flex_3_application_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/define_advertisement.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/ssc_10th_class_maths_formulas.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/management_of_anaphylactic_shock.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 6

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_off00006132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6132 5348 bytes
SHA-256: 87434f2aeb100a6e79a908a2b7b0edf30a86c16b23df7da38780d7508b9275e1
font_01_sfnt_off0000733c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x733C 10936 bytes
SHA-256: f6e16ae0aa6ef9fade25db2a19ba55e59a38b4843f02bce2063c1437dfcdecbd

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