Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f71d44887a3570…

MALICIOUS

PDF

44.8 KB Created: 2020-08-14 01:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b34f2a784180c51a4c5b180680de94d8 SHA-1: 00a70f4043cebfa14ba4f732ce9db8213b411ee3 SHA-256: 91f71d44887a35700c70ec0fcb2f0fa5fccd22f6fe7feccfa50a834fe085fbfa
194 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to external resources, which is indicative of a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though partially corrupted, contains text related to a 'California background check disclosure form' and includes the malicious URL, suggesting a social engineering lure. The presence of numerous PDF links, many hosted on Shopify, further supports the link farm heuristic.

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.ru/pify?keyword=california+background+check+disclosure+form In PDF document text
    • http://files.rockgardenapartmentspefkos.com/uploads/1/3/0/7/130738998/pazerobu-boxujup-losumew-sarok.pdfIn PDF document text
    • http://nirojo.naturecalling.us/uploads/1/3/1/4/131410227/4933389.pdfIn PDF document text
    • http://files.oharts.net/uploads/1/3/0/7/130740118/kumewinudep.pdfIn PDF document text
    • http://files.kdadmedia.com/uploads/1/3/0/7/130739810/88def88c5ce070e.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/1/0433/4983/5930/files/ladunuxovemar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6042/7928/files/estadisticos_descriptivos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7757/4562/files/9th_class_english_textbook_ssc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0310/0836/files/anemia_perniciosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2022/1596/files/dewalt_electrical_code_reference.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/advantages_of_computerised_accounting_system.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0496/0661/files/wotisapekipufurabew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2171/4079/files/78675606328.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/sorijetisamotuxunenomom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/vowovokuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4568/2332/files/nabujawawavitaxojibolaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/lirilefem.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 6

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_off00007005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7005 5544 bytes
SHA-256: 00ee9906aefd8c0eb62741fdbbb1806c8d54ec47d899d24466b48f1a5da8c399
font_01_sfnt_off000082ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82AE 10368 bytes
SHA-256: 985f7ead8e148b7fe50e4a65cfffd8f9d9371b65412222b8780e116a5505d3cd

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