Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5385839e42847f…

MALICIOUS

PDF

39.9 KB Created: 2020-07-28 03:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6bc8d405632ea092c45a80abbf9c2eba SHA-1: 4cfbb18dbba76f4dcb567172e1574cef67ec217f SHA-256: 8f5385839e42847f7c171057d630d95671cdfcde2d779001c681ce63b3d53010
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic. One of these links, ttraff.com, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Aiou admission form 2019', suggesting a lure to attract users to click on the malicious links.

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=aiou+admission+form++2019 In PDF document text
    • http://files.futurescapes21c.com/uploads/1/3/2/6/132682868/jijodox.pdfIn PDF document text
    • http://files.2ndchancehypnotherapy.com/uploads/1/3/2/6/132696214/655720.pdfIn PDF document text
    • http://files.tancarrphoto.net/uploads/1/3/1/0/131070001/1227298.pdfIn PDF document text
    • http://files.mastudentnurses.com/uploads/1/3/0/7/130776607/nokogajowabobekexu.pdfIn PDF document text
    • http://files.ohiothunderbasketball.com/uploads/1/3/1/3/131381204/gakovabivifazirivo.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/1/0433/3587/6776/files/dezoke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3845/7501/files/9266175548.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4658/3976/files/vawexesejeber.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0402/6280/files/80582733165.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0862/9659/files/14723884614.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9327/0429/files/73306835411.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0604/2013/files/nenokigilomezerikar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7487/9641/files/29069660497.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/jefuzadodijifipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/88541659137.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18410569865.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_off000060ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60EC 5176 bytes
SHA-256: 565501987baac5648db7cf9730b5c845bd4f93fba700affdedddb44f23f40c91
font_01_sfnt_off00007254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7254 9516 bytes
SHA-256: 18fb9b205090219da6f47b341972c47d4fcb4bce81ccac1aeaaf851b23400a6c

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