Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d376e9debb547b0…

MALICIOUS

PDF

38.4 KB Created: 2020-07-11 00:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 70d6f80eb9ab505671c966f4f5dac80f SHA-1: 9df7c9c5d4fed343d6ed61207b32a80324d1d508 SHA-256: 3d376e9debb547b0dfc47745cd79c132c837375bc78fa3c71c4b049f3150fd60
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a mass of external links, many of which point to a link farm designed to host further PDF documents. One of the embedded links, https://ttraff.cc/pify?keyword=ada+restroom+requirements+pdf, is identified as a malicious redirector. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for phishing or malware delivery. No scripts were extracted from this sample.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=ada+restroom+requirements+pdf In PDF document text
    • http://files.beechwoodhills.org/uploads/1/3/1/8/131871727/7480499.pdfIn PDF document text
    • http://files.jerichostem.com/uploads/1/3/0/7/130775116/5cb492ad83f.pdfIn PDF document text
    • http://files.tt-motorcycles.com/uploads/1/3/1/1/131164414/duvunovune.pdfIn PDF document text
    • http://files.industri-motion.com/uploads/1/3/0/8/130874411/gakafuzobusos_xoduzojisivili_denodelim_vugorukorubaduz.pdfIn PDF document text
    • http://files.chiropractorroyaloakmi.com/uploads/1/3/2/6/132682042/vowegurusakebel.pdfIn PDF document text
    • http://files.novatogsdaycamp.org/uploads/1/3/0/7/130775186/wibotowi.pdfIn PDF document text
    • http://files.highcountrycorals.com/uploads/1/3/0/7/130739780/edadb3e8e0.pdfIn PDF document text
    • http://files.jaynestringer.com/uploads/1/3/2/7/132740694/sorule.pdfIn PDF document text
    • http://files.adriaandewit.com/uploads/1/3/1/0/131071191/44708.pdfIn PDF document text
    • http://files.nipomodrama.com/uploads/1/3/0/7/130739247/livajemowupovo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rixoselojata.files.wordpress.com/2020/07/61920524436.pdfIn PDF document text
    • https://zuzilunox.files.wordpress.com/2020/06/5961806766.pdfIn PDF document text
    • https://taletabito.files.wordpress.com/2020/06/dewotosojiwozowidebi.pdfIn PDF document text
    • https://divezifek.files.wordpress.com/2020/07/77397732534.pdfIn PDF document text
    • https://jubowut.files.wordpress.com/2020/07/73426893978.pdfIn PDF document text
    • https://wakukozid.files.wordpress.com/2020/07/22129913017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mejamuzeditika.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1384/8731/files/vugijopigedabul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/momewegis.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_off000057c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57C5 5152 bytes
SHA-256: 2b348b10aadf80cf68a3aec0a4906008d905c4774f4e38e5215306fde3d53677
font_01_sfnt_off00006931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6931 9904 bytes
SHA-256: a12c987700129c9ab812465e87f8e9244748518e84a31303c9f847586d1a801e