Malicious PDF — malware analysis report

Static analysis result for SHA-256 857642e73d738453…

MALICIOUS

PDF

35.8 KB Created: 2020-08-01 11:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ac5daeb3e7bdc199218502ae55be012d SHA-1: 5cab7eab89f21a7434fc2092378ffc3601b49109 SHA-256: 857642e73d7384536937cdc1becf4543b5bf68ef83c486788e8b9cbfa2070794
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service (ttraff.cc) that is flagged as malicious. This indicates a phishing or scam attempt, likely using a 'free download' lure as suggested by the SEO link farm heuristic. The ML classifier also strongly indicated maliciousness.

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=pearson+lab+and+mastering In PDF document text
    • http://files.jenniferyackel.com/uploads/1/3/1/3/131383791/2483817.pdfIn PDF document text
    • http://files.wickycandlesllc.com/uploads/1/3/1/6/131606951/baxomopur.pdfIn PDF document text
    • http://files.malovicmak.com/uploads/1/3/1/0/131070712/3420880.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/1/0432/7673/0533/files/83065962297.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/rugapesawixupuraku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7749/2118/files/zubaxuxiregabosatugimo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7352/8213/files/85392614893.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96512150342.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7962/1026/files/zonaxunenizebejexameko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3020/8924/files/18140903628.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0184/7708/files/42850023473.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7330/5762/files/ladaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1274/2550/files/dagafude.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/jesulilege.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/3568088610.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4429/8133/files/14093065062.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7046/3895/files/24395378789.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 2

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_off00004e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E96 5288 bytes
SHA-256: 73b417c5aab55dbb95be873afd93d98e2aa6be0a7f7e20d940a9a9672ceefaa2
font_01_sfnt_off00006076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6076 10648 bytes
SHA-256: 00377e81c8a3a138dbaeffb50ac2c91488792c6f7c9c056a8c8cc6f3746058bc

Open this report in the interactive analyzer, or submit your own file for analysis.