Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec26e4c9fff9007…

MALICIOUS

PDF

34.8 KB Created: 2020-10-05 20:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 156b988582fd9fb16896a992260a9345 SHA-1: ed5ceff6f453fc5bce6b619115fe91cdf6c57159 SHA-256: 7ec26e4c9fff900725b318f889b7e1881c405e5fbc168836ece194486ad3b0a1
194 Risk Score

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/strik?keyword=design+thinking+process+methods+5th+edition+pdf In PDF document text
    • http://jisudejaf.theassertorsc.com/uploads/1/3/1/4/131437668/nivalum.pdfIn PDF document text
    • http://files.thequestofjz.com/uploads/1/3/0/9/130969176/5525352.pdfIn PDF document text
    • http://gadal.annabelleterbetski.com/uploads/1/3/0/8/130813799/7088450.pdfIn PDF document text
    • http://files.joyfullfoods.ca/uploads/1/3/2/7/132710683/e1689.pdfIn PDF document text
    • http://files.freegirlmanifesto.com/uploads/1/3/1/0/131071082/xuvafofusi.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/1/0484/5030/6198/files/centripetal_acceleration_and_force_worksheet_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8428/2008/files/7891512503.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0038/3646/files/89494675006.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/dearly_departed_script.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6907/9193/files/how_to_look_expensive_andrea_pomerantz_lustig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e394de-f8bc-4a71-9b08-5644a83d7f35/fopipubamux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b520c56-7a54-4129-9c87-9bd55ab72a3b/64914123977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6a3fda-fb46-4745-b4c0-a6dbd1f37523/57994412598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab9d570-5878-4b07-8cae-a6502689acf5/78004083140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5113560-8b79-4d02-9998-46850d61a4a8/lejefixepamimoroni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/41339609734.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0931/3438/files/jizejuvabafupaxinarob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3950/5054/files/amoeba_sisters_introduction_to_cells_worksheet.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_off00004cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD8 5512 bytes
SHA-256: 65aa74a980e93f9bc31598a609164e22864667b486e96fffe20213dd22270ddf
font_01_sfnt_off00005f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7A 8964 bytes
SHA-256: e542f6f1d4ad47a948c63cd9bd51d4118b8f3b46e04512acec3c4ee360b74ba1

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