Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14a271be70b1f2d…

MALICIOUS

PDF

45.6 KB Created: 2020-10-29 12:18:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0e8718c7c0250c7d103851294bd0292b SHA-1: 867091ecaa5a63a3ae0c859ba0afe883149042a9 SHA-256: a14a271be70b1f2d104ed6bebd651820795172278065c132474ab3699048676a
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector infrastructure. The primary redirector URL is https://gettraff.ru/aws?keyword=what+is+bell%2527s+number, which is known to lead to malicious content. The document's structure and numerous links suggest an attempt to create a link farm for SEO manipulation or to direct users to phishing or malware distribution sites.

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://gettraff.ru/aws?keyword=what+is+bell%2527s+number In PDF document text
    • https://fewaxozane.weebly.com/uploads/1/3/4/3/134341296/dupefupuwi-gitudaxapolig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f8a0e0853304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f88a49d24bbd.pdfIn PDF document text
    • https://pafuwaron.weebly.com/uploads/1/3/4/3/134385690/fowigideranevebudiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_5f982360d9b16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_5f88db032b672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381737/normal_5f92349135028.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/310717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5f8ff9196fed3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_5f88145463f15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/megulu/febrile_neutropenia_pediatric.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74868531-c0fe-437e-87c6-c76e30486420/how_tall_was_allen_collins.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/kasazezapajogefipewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a7ad48-fe6c-4aac-a9da-7ceabe889d84/60980810528.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/96842365006.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 8

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_off0000746e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x746E 5112 bytes
SHA-256: f378ca4b95ffd5de416bc86affda73ad756e613aaba03738c4c34d61a3f61f22
font_01_sfnt_off000085b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B5 10580 bytes
SHA-256: 1320102c90b70b2946dacd2a779ea74d6b8adf95dedc1a556125d88a9f3287ce

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