Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c43f10d211e574…

MALICIOUS

PDF

43.9 KB Created: 2020-08-21 06:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 77a71e68a83c99ee3a5b758c78e73ebb SHA-1: 6a7a5bb7c88d6a8041e5d736d384903b9430514c SHA-256: 91c43f10d211e57471f82b52d96668a5fcca301678ac22659b3fce94028ad9b0
202 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic firings indicate that the PDF links to known malicious infrastructure and functions as a link farm, likely for SEO poisoning. The document body text, though partially corrupted, contains keywords like 'Bill invoice template word' and references to the wkhtmltopdf tool, reinforcing the lure of an invoice. The primary attack pattern involves tricking the user into clicking the malicious link, which redirects to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=bill+invoice+template+word In PDF document text
    • http://files.gpuuc.org/uploads/1/3/1/4/131437563/tatidelut_sipezerexo_tarujo_fazeb.pdfIn PDF document text
    • http://files.kieratippett.com/uploads/1/3/0/8/130874683/e2c36b267d184e6.pdfIn PDF document text
    • http://files.bellclub.org/uploads/1/3/1/4/131437984/b1a6070276.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/1/0433/8014/6334/files/16915221379.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0778/6651/files/82695651667.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/blender_full_tutorial_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/0737/3476/files/coliformes_totales_nom_112_ssa1_1994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5764/2648/files/o_positive_blood_type_diet_to_lose_weight.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7565/7121/files/building_background_knowledge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5563/5880/files/wow_leveling_guide_1_110.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/wewalog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5534/8888/files/mokoxulof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/separation_process_principles_3rd_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1271/6701/files/77288495962.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 5

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_off00006e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E14 5240 bytes
SHA-256: 5a4de4686d9fec0561e0b71fc0687f006466f47ac23b04a0866dc4bfa7514768
font_01_sfnt_off00007fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD0 10332 bytes
SHA-256: 42efb576273f7111457292e24c02c36a160eaf036d193081d443f738ad9b5ea9

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