Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b128856ddb193f6…

MALICIOUS

PDF

46.9 KB Created: 2020-10-29 23:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 39a34775e581714aaa03c4a158bbcec4 SHA-1: a3410a1ef2ae33f1a03489749c89bbc3546fdd24 SHA-256: 9b128856ddb193f659258891659279e637ea628725fac164a609db8e133c40be
202 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=black+korean+drama+cast In PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/3990231.pdfIn PDF document text
    • https://voduzivet.weebly.com/uploads/1/3/1/6/131607522/fapelufifew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f871f0e4ba33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_5f8e160a6d97e.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/1/0502/9989/5990/files/45905638055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b06f3da-20a4-4dd9-b348-1fdd4bb8afa6/social_media_trends_in_the_middle_east.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7414/9282/files/maytag_user_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9891/5484/files/53456225547.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/3218/8357/files/92018151562.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/raising_your_spirited_child_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7612/7394/files/edit_on_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/jidigijosavavagosaviv.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/fuliboredolesu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6C 3196 bytes
SHA-256: d449955a8516748257695aacf48f8a1a86103fd11dcceb8f4fb23de991e936fd
font_01_sfnt_off000076f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76F0 5200 bytes
SHA-256: 736e59434abccc6efa6a1c4a0c896337383fd5615a3c5a38e1538d4659d9b245
font_02_sfnt_off00008889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8889 11236 bytes
SHA-256: 4087ed60a898bc291afdabe5461b08ff2f1e1fbc9d714defa92998d7dd92ea61

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