Malicious PDF — malware analysis report

Static analysis result for SHA-256 858a1278326dd6ca…

MALICIOUS

PDF

32.9 KB Created: 2020-08-13 00:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5394dd78097963d15b088eb5413341f0 SHA-1: a2bd7a0709b852bdd02d027cda5c00d79e783a45 SHA-256: 858a1278326dd6ca9f2437d941535cb7cd087858743d7f45b19a69eeb85a50f8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.com) known for malicious activity. The document body and heuristics indicate a lure for free downloads, likely leading to phishing or malware. The ML classifier strongly supports the malicious verdict.

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=new+headway+beginner+student+s+book+second+edition+pdf In PDF document text
    • http://files.kellyskylefiles.com/uploads/1/3/1/4/131453146/xebuw.pdfIn PDF document text
    • http://files.thebathhouseco.com/uploads/1/3/2/7/132740598/gurogow.pdfIn PDF document text
    • http://files.steeplechasemusic.com/uploads/1/3/1/6/131637553/995fabbf2.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/1/0432/3993/2064/files/vokug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/vawedet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8429/9936/files/download_netflix_movies_on_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7221/5448/files/prentice_hall_biology_book_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9011/5736/files/70467145132.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2352/2216/files/ajaya_rise_of_kali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54748680829.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/7492/3169/files/structure_of_amylose_and_amylopectin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/31153351184.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/59744643278.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 4

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_off0000432b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x432B 5752 bytes
SHA-256: 9da229201a642c588cb7633a117a9ab724d7c4ec7b1481ffed15e58c282761ca
font_01_sfnt_off000056d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56D2 9304 bytes
SHA-256: 0635e4eee6a7f34aaa5719209ea6cef420e6bacc29382d366799d09dbc325c7b

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