Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f6c7e7c7c41fb7…

MALICIOUS

PDF

40.8 KB Created: 2020-11-05 08:54:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: e5020bc782b5daea24489acaf9ff429f SHA-1: 5f71c1ffb2bb858ec3ceaed3fe1cd439c86c7cf2 SHA-256: a8f6c7e7c7c41fb78ab125ce27c1cdc03e4bcceb8ad4afe5d7851dfdff935c4e
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/wuzuserubopo.pdf.
  • 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.me/123?keyword=yahoo+mail+mobile+login In PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/wuzuserubopo.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/bexepuwaba-fixadujogaxik-dewapup.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/7037811.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/duwadi.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/natogod-basukovite-tovabixikiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b23103c-befc-4061-9a4d-aeacc9b18c0b/32133614276.pdfIn PDF document text
    • https://s3.amazonaws.com/lopazura/vodob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c5632a-9165-439b-8290-d1e9722191a0/maruvarthai_pesathe_mp3_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/bamoxoxefozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b377444-4075-44d4-86f6-96eafdcd42dd/57510103164.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61BB 4928 bytes
SHA-256: 8e668b61094f212bd8ea2060fbf180b3314f72a4fc605cf3f7cef870d27dd621
font_01_sfnt_off00007260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7260 10644 bytes
SHA-256: c10f7e3d46caec887ff7cec6e0f2e9d30587afb15f70ef70204ee3bd7bfda3e5

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