Malicious PDF — malware analysis report

Static analysis result for SHA-256 a392a7d9f4e36779…

MALICIOUS

PDF

32.2 KB Created: 2020-08-08 05:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bd69f0b10767e6f7785215b1797c8d21 SHA-1: 28876e667bbeef3ef4e2f158be0ea020455af663 SHA-256: a392a7d9f4e36779457a9bf634642bcb63292a01f2c203e268ea06e684abf679
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=cambridge+checkpoint+english+student+book+1+answers+pdf'. The document body, though heavily obfuscated, contains text related to educational material, likely serving as a lure. The presence of numerous external links, including the malicious redirector, indicates an attempt to drive traffic to potentially harmful sites.

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=cambridge+checkpoint+english+student+book+1+answers+pdf In PDF document text
    • http://gusejusu.twohappyhedgehogs.com/uploads/1/3/1/1/131163635/zegadivavepen.pdfIn PDF document text
    • http://files.vanderlegal.com/uploads/1/3/2/6/132682627/cb232.pdfIn PDF document text
    • http://kafuwivul.shaydanielleacademy.com/uploads/1/3/0/8/130874038/xuvukawexak.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/1/0433/0687/7080/files/wowivitotorinu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2684/9700/files/84255586928.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/8778808465.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/best_rooting_apps_2016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/93993067858.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9261/5073/files/belgaum_district_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0962/2695/files/tapudunej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/zodijutefokatexowiwilotav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6717/9162/files/original_effortless_english_lessons.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3160/0031/files/pefizonemaginipek.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_off00004040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4040 5824 bytes
SHA-256: f219151bbbc6389ecb309bee731a55b7c2178943c70e90472bc549aa8df1379d
font_01_sfnt_off000053f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53F4 9324 bytes
SHA-256: 3538f377e9cfb3a2d44c623ab88df315366070a8972bc7ef2f5edb6277b02e6c

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