Malicious PDF — malware analysis report

Static analysis result for SHA-256 8838cfc66f7186ca…

MALICIOUS

PDF

39.7 KB Created: 2020-08-06 02:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3b2f1268e80f7b4bbb491c65b1226b35 SHA-1: a4927646fe101205984a6b29c5c3f07185d7512c SHA-256: 8838cfc66f7186cac053e9b56c55d36ae6b7ada693d14b312a8088a5500d56cd
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and IOCs. The presence of many external links suggests an attempt to manipulate search engine results or to distribute malicious content via a link farm.

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.cc/pify?keyword=mapa+metro+rj+pdf In PDF document text
    • http://files.pbcwv.net/uploads/1/3/0/7/130739544/7291778.pdfIn PDF document text
    • http://files.publichealthmuseum.org/uploads/1/3/1/3/131384789/a826b1b39.pdfIn PDF document text
    • http://files.healthafter40.blog/uploads/1/3/0/7/130775983/3470811.pdfIn PDF document text
    • http://zotibaka.wrkimages.com/uploads/1/3/2/7/132710780/445233.pdfIn PDF document text
    • http://files.spectra-simulator.com/uploads/1/3/1/6/131637919/mirapibulofa.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/1/0432/6470/4662/files/septic_abortion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2920/7957/files/piazzolla_adios_nonino_tango_rhapsody.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1632/1184/files/vigivibabizujidatagijen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/73745371750.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/44096451197.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7985/0391/files/mopurewilasefet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/12138504859.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/84866220583.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/runomelolelivumuteni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7465/8197/files/2768549237.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9111/6700/files/jikivakegepib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4410/0506/files/giraxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/7628/4569/files/6th_grade_social_studies_worksheets.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_off00005ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE4 5056 bytes
SHA-256: 17f8e4a2ae0ece47cebbc728390651d863404312c32d20a4da05b95943138b3c
font_01_sfnt_off00006e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0E 10732 bytes
SHA-256: ec061f799747f08ffc80cd635cee0e329667167d3c30979a27c60cbbe4aa2bd1

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