Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c80f86b54decfe…

MALICIOUS

PDF

42.3 KB Created: 2020-10-01 13:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1e66f6868000ab64f431a1bea9c2467b SHA-1: cea5cb31fc2fe80f1fc9eb54e60eb872388489a4 SHA-256: c4c80f86b54decfe7edfd83922d4f7cacf8fd9cf6c494d2f05a5afe57bc3a602
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to an SEO link farm, with a primary redirector URL identified as malicious. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users to a potentially harmful site for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ggtraff.ru/strik?keyword=destination+a2+pdf+vk In PDF document text
    • http://files.grandportraits.co.uk/uploads/1/3/1/1/131164456/6858705.pdfIn PDF document text
    • http://jevub.foundtobefit.com/uploads/1/3/0/7/130776826/7839930.pdfIn PDF document text
    • http://files.emilyhalbig.com/uploads/1/3/1/3/131398250/nojaxekuwabixoju.pdfIn PDF document text
    • http://files.melancholicmannequin.com/uploads/1/3/2/6/132681450/wasubunurode-lelogu-toledodog.pdfIn PDF document text
    • http://files.empressreadings.com/uploads/1/3/0/9/130968926/9328128.pdfIn PDF document text
    • http://vukonupu.dyakcraft.com/uploads/1/3/1/4/131407535/46465f6a0.pdfIn PDF document text
    • http://files.justinsports.net/uploads/1/3/0/7/130738984/danidadaba.pdfIn PDF document text
    • http://giguveset.clairekredfield.com/uploads/1/3/0/9/130969332/pagazomopo-sasoxe-rakinegalowe-feruz.pdfIn PDF document text
    • http://fefiker.demolitiondownersgroveil.com/uploads/1/3/0/9/130969723/sifama.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/1/0436/3619/5488/files/29798898112.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3123/0624/files/75069061387.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0585/5904/files/electron_configuration_for_aufbau_rule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5651/0616/files/vemokinavuwupesivagufime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8648/7455/files/short_argumentative_essay_examples_for_high_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6741/6471/files/wividuforivaro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/aqualung_i550_dive_computer_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5771/7143/files/teclast_98_air_3g_battery_replacement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4356/8278/files/f2p_range_training.pdfIn 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_off00006aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA3 5164 bytes
SHA-256: 912137cc7d6e06c951726906035c0580dc2eb1e063c6a8eda8f43e14169f8ca2
font_01_sfnt_off00007c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C61 13100 bytes
SHA-256: c201cd76be30b5809b3686ac4b7c927ca17dbf95344bb2e715dbd4653e5534c0

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