Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39ec43d3aca4d99…

MALICIOUS

PDF

42.7 KB Created: 2020-08-12 15:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: cb67ed817a711f39798a6173e51000c3 SHA-1: 7e32f22a9efd0970625d85aab9b56a9035163550 SHA-256: a39ec43d3aca4d99464e7f84b4400eea18bd8797e80805b05b44f6def9af356e
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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=andhra+pradesh+history+books+in+english+pdf In PDF document text
    • http://files.naturally-jo.com/uploads/1/3/1/6/131637409/8896265.pdfIn PDF document text
    • http://files.tahoevistanainn.net/uploads/1/3/1/4/131453415/gebiwetuk_senotegijogo_kumoxowogat.pdfIn PDF document text
    • http://wirefevu.sunrisehealthmassagetherapy.com/uploads/1/3/0/8/130814674/guvupoveruz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/97108884403.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/gevanuraxilusexupedoniluw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/jejupitu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8705/9352/files/sofujafogativusasegi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/github_remove_commit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/nibekug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2427/7927/files/xepejapelakeperami.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1855/9389/files/sivaresilajo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1123/4199/files/31778020968.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0540/0472/files/zitokupadoxolij.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_off000057cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57CF 5600 bytes
SHA-256: 74f629a015bc2e48116d0eab339296d93144ef9fcbaafcc4d955e458ba63751e
font_01_sfnt_off00006aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACA 3232 bytes
SHA-256: f0cb4d0846259b840b110eb10ad34a42e3094396fcc9b9ec68a3c79eeb7b7591
font_02_sfnt_off00007858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7858 10376 bytes
SHA-256: 1e206e742eeae7463ea0a352b985d17b0a7215db797fcadd5263c97f069fb708

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