Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7e1139714f9c15…

MALICIOUS

PDF

44.9 KB Created: 2020-07-10 15:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 354718941d356e368bb8b99725beba1b SHA-1: eb275f40b8077b38971173e9bb4560d847060dca SHA-256: bf7e1139714f9c1561064b62b94a1b53ce239349d6c8d97230787d6d8912112f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a deceptive title related to medical information to entice users. It embeds numerous links, including a redirector URL, that point to a link farm infrastructure. This suggests the primary goal is to redirect users to malicious sites, likely for further exploitation or phishing. No scripts were extracted, and the document body was heavily obfuscated, limiting deeper analysis of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=carcinoma+papilar+de+tiroides+pronostico+pdf
    • http://files.kresinternationaladmissions.com/uploads/1/3/1/4/131437454/ddaa923282b03a.pdf
    • http://files.cafedatalkalamode.com/uploads/1/3/1/4/131483550/3bbbf7.pdf
    • http://files.spiritualfringe.com/uploads/1/3/2/6/132681316/zozibekidare.pdf
    • http://files.moenkopimemories.org/uploads/1/3/1/4/131408537/3506090.pdf
    • http://files.gsskids.org/uploads/1/3/0/8/130873973/korunavo.pdf
    • http://files.andrewpeterson.net/uploads/1/3/1/3/131382808/sisivafenaw.pdf
    • http://files.boynecityhardware.com/uploads/1/3/0/8/130814172/juroja_zozarixegusete.pdf
    • http://files.crookstonmusic.org/uploads/1/3/2/7/132741189/1492540.pdf
    • http://files.lively.fi/uploads/1/3/0/7/130739895/2307869.pdf
    • http://files.himburgelectronics.com/uploads/1/3/1/3/131378918/e081c44.pdf
    • https://lipipav.files.wordpress.com/2020/06/40443176621.pdf
    • https://wafasive.files.wordpress.com/2020/06/nagofedanos.pdf
    • https://dugiwelo.files.wordpress.com/2020/06/24850592855.pdf
    • https://mepekaxeke.files.wordpress.com/2020/07/21788274731.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9646434013.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/naxilivapobirakimo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28650507632.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71482320097.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kesutuzijakakewinepubad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/botolewapaniwid.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072b7.bin
582e2d7ff076e28bc01a9737856770b5367fda0bc018baa37627618c4e629c1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B7 5112 bytes
font_01_sfnt_off000083f9.bin
5efdbe9a8d2da80203fcef11b0843dcaf6307f2279551968d006f8fa0abc744b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83F9 10104 bytes

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