Malicious PDF — malware analysis report

Static analysis result for SHA-256 6962b922916abd95…

MALICIOUS

PDF

81.8 KB Created: 2020-08-11 09:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de3433e5bcd7497f257825bf724f6110 SHA-1: a88262ed448fd466a49aff61229b07496bbfb730 SHA-256: 6962b922916abd957c8937bebaec743b8a191bc4d46756e34a79a80571512429
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded artifacts suggest a lure for downloading a PDF, with a specific URL present in the document body that points to a redirector. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious download lure.

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.
  • 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=bukhari+sharif+in+arabic+pdf+free+download
    • http://nasex.zepedamillan.com/uploads/1/3/1/8/131856706/a6cc172ad7dee.pdf
    • http://files.itsbammtastic.com/uploads/1/3/0/8/130873983/redijugogonawu.pdf
    • http://files.ebbtidewellness.com/uploads/1/3/1/1/131163914/gigabemotewadob.pdf
    • http://zuxep.lflplatform.net/uploads/1/3/0/7/130738799/tubodelorixof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2805/4169/files/11810908499.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/tobawilawazo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8869/9802/files/pekekafeje.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/beginner_spanish_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4694/files/charles_dickens_hard_times_summary.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/29633061589.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12339474235.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/92519341100.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/21390908721.pdf
    • https://cdn.shopify.com/s/files/1/0432/7525/5972/files/4616861290.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010f9b.bin
43cd31594b773b494d1d0a9b1e8e85c26478e61207d6d2bf0835b162231e10e9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10F9B 24132 bytes
font_00_sfnt_off0000d5a3.bin
cfae7fbf1f39c182c92beaa0783b10c018afd41eb4b7d3d3eee354d9b9028537		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 5588 bytes
font_01_sfnt_off0000e8a4.bin
8ffd2155a7b8bf6c6ed35f5b19a38db19650f2cfaff3b114fca211e316f5a700		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 11404 bytes

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