Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b57f3da2cf827f5…

MALICIOUS

PDF

44.3 KB Created: 2020-09-10 17:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 998bca5d3c6b8bfd6348459aa090097a SHA-1: bb96e79ec3ed3dbc2171ce65cbc252f4cadfc1e5 SHA-256: 9b57f3da2cf827f558ffb81e7543a692fa8e339a6568cca842b6c2ba9ef98014
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://ttraff.link/wix?keyword=cheppave+chirugali+audio+songs++please In PDF document text
    • http://kanofuf.uniontownartclub.org/uploads/1/3/0/7/130739974/c38b0dcec15636.pdfIn PDF document text
    • http://files.teachermaxwell.com/uploads/1/3/0/8/130814515/18b765a085.pdfIn PDF document text
    • http://files.mistymaids.net/uploads/1/3/1/6/131606291/vadarikof-neviz-lipisusap-dasefulamakeso.pdfIn PDF document text
    • http://files.journeytobetter.net/uploads/1/3/1/4/131453348/kupelubonelod.pdfIn PDF document text
    • http://files.memorablemomentsbymichele.net/uploads/1/3/0/9/130969190/5308725.pdfIn PDF document text
    • http:///\/www.lyricsintelugu.com\/2010\/08\/cheppave-chirugali-song-lyrics-In 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/1/0432/1021/1491/files/minolta_srt_201.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8341/5204/files/19023855197.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/4376/1824/files/chakram_full_video_songs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/59528516406.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9267/9582/files/82329060817.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/34736905719.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6869/3407/files/not_enough_memory_to_read_worksheet_powerpoint.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/rekarunanijivetipigak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/36129801863.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/sinibepogelulukudoxarefo.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_off00006263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6263 5300 bytes
SHA-256: 7fcd9982030d4a22c98349ae053df799cca1855e0976f259c1e7c0623ee407bf
font_01_sfnt_off0000745e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x745E 15620 bytes
SHA-256: c94a300b85346bd191fda33d723dc0977eecfa53cdc2f1c5253b495ecc76fd8a

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