Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a33dbcb3a7fa1f6…

MALICIOUS

PDF

40.5 KB Created: 2020-08-21 05:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5a8a2dc4d20e179fec437ec2ce794357 SHA-1: 6ffae83b72a793e7956fbceac10872a3c8bff748 SHA-256: 6a33dbcb3a7fa1f6c676ff291a9c0b7ed3ad5fb84993d8e6298f14626806a395
194 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominent URL pointing to a known malicious redirector. The document body, though obfuscated, contains text suggesting it is a lure for 'Code.org answers lesson 17', aiming to trick users into clicking the malicious link. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links further supports a malicious intent, likely for SEO-based phishing or malware distribution.

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=code.+org+answers+lesson+17 In PDF document text
    • http://files.lousavage.com/uploads/1/3/1/8/131858791/7a9a527f89baa.pdfIn PDF document text
    • http://monozi.nlpandmbitcoach.training/uploads/1/3/1/3/131398020/mebuzemapawow-jewerabosax-wenegosinigovad.pdfIn PDF document text
    • http://files.otsegofitness.com/uploads/1/3/0/7/130738889/6020829.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/1/0447/7432/6438/files/teaching_addition_of_fractions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2295/8248/files/kivazejixokemas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2823/3883/files/food_crossword_puzzles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5838/8374/files/28118790379.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/40114484169.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tozonolemudafolafoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7564/7128/files/kixevekokipubib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/3137/4493/files/wewenapekogajebexetuzeki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/barlow_condensed_bold.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2589/1479/files/14866588433.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 6

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_off000060dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DC 5152 bytes
SHA-256: 434c3341763c49a5a52ee8663916d1dfa31286846765b7f5b7ce0f643b23e2b8
font_01_sfnt_off00007293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7293 10244 bytes
SHA-256: a7ce2b80e3540df64ada08dd3bb86dd707368c347db22ae5a98d3c5f7140659f

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