Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b473de7181c0aa3…

MALICIOUS

PDF

48.2 KB Created: 2020-08-22 16:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3b719da29682491a9a9828c3295894fa SHA-1: e0891f390f70c2665e41a66a680c2d56b6d6eded SHA-256: 8b473de7181c0aa33da4fa5cf2f783d3b465d4dc5c13dae60b5854ccc2eab419
194 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though partially obfuscated, contains the URL 'https://ttraff.com/pify?keyword=aprender+a+leer+hebreo+pdf', which is the primary indicator of malicious intent. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, likely to manipulate search engine results or distribute further malicious content. 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.
  • 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.
  • 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.com/pify?keyword=aprender+a+leer+hebreo+pdf In PDF document text
    • http://files.alsisfunds.us/uploads/1/3/0/8/130874329/175aafac02f74.pdfIn PDF document text
    • http://files.rachelchristofferson.com/uploads/1/3/1/4/131437385/476810.pdfIn PDF document text
    • http://files.limassolsportsmassage.com/uploads/1/3/0/8/130874129/laxuvovobopekidom.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/1/0440/1886/0190/files/27020938474.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/rikakikanomogijatino.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/sue_bryce_posing_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4131/6249/files/analytical_mechanics_of_space_systems_schaub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/3955/9578/files/comment_fusionner_plusieurs_sur_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3063/3881/files/kigomaxabux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2644/6498/files/vojonaderewodizejedeka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4173/3273/files/xumanam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/52825138881.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7270 5080 bytes
SHA-256: 92e0b8b5da8d01e325c75b073aeaac0815b25fb8c404e4ea79f6bc01c00e96e2
font_01_sfnt_off000083a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83A3 15856 bytes
SHA-256: 3b1160c79140a0df0f50d957b44b7c3bce30c9155819e2090bc1f4dd6daf1ee7

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