Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a3e72eb893aade…

MALICIOUS

PDF

41.0 KB Created: 2020-08-10 16:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3f98b870e6f6a592350241a256085189 SHA-1: 05e9fa21b54822c24d9ae52bd4a9519bd3cc32f4 SHA-256: 88a3e72eb893aade5fc90dc971f395f091ac5192a87dc47569346eb9ea3c8f00
234 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at `https://ttraff.com/pify?keyword=conjunctions+exercises+pdf+intermediate`. The document body, though heavily obfuscated, contains text suggesting it is a lure for "conjunctions exercises pdf intermediate", likely to trick users into clicking malicious links. The presence of many external PDF links, some algorithmically generated, indicates a link farm or SEO poisoning attempt to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=conjunctions+exercises+pdf+intermediate In PDF document text
    • http://files.transformingliveschurch.org/uploads/1/3/1/4/131438563/2664414.pdfIn PDF document text
    • http://silajuwo.northernriversbathroomrenovations.com.au/uploads/1/3/1/4/131408738/xepukuxa_kofilon.pdfIn PDF document text
    • http://files.hillsideschoolcville.com/uploads/1/3/0/7/130776043/muvetatatokuxep.pdfIn PDF document text
    • http://files.rakshitestates.com/uploads/1/3/1/4/131407138/9151567.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/1326345950.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/marepuwofaruzok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1869/8400/files/advantages_of_computers_in_education.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0895/8362/files/safosufiwasadil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/5951467455.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8176/0935/files/vulegebu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0908/9447/files/74350839201.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84005007378.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85155057715.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6594/1917/files/23671780065.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53B1 5316 bytes
SHA-256: bbeeb304fc08129b935ab38909b56c7101a5b7b5719460aa779be8226a1a7cb2
font_01_sfnt_off000065b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B6 10576 bytes
SHA-256: faeccde3873e3c72a49b9b9f6ddca0dd79bdfea296cb506a3bb343365bbb34de
font_02_sfnt_off00008906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8906 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361