Malicious PDF — malware analysis report

Static analysis result for SHA-256 827b6fd4d2d561e9…

MALICIOUS

PDF

43.3 KB Created: 2020-08-22 19:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 70cf332bca5d6aae7c9ce9ef41b87274 SHA-1: 9f96c5cd4ce74c68f0cf229be709dafce260f09a SHA-256: 827b6fd4d2d561e9ed282e6b19a9fc78ad54fe2b7890d967aa764400f5bb51a7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service (ttraff.com) that is flagged as malicious. The document body and embedded links are designed to appear as free educational worksheets, a common lure for phishing or malware distribution. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector confirms the intent to lead the user to a harmful destination.

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=free+subtraction+worksheets+for+grade+2 In PDF document text
    • http://files.septemberkrueger.com/uploads/1/3/2/6/132682630/tumatafaxog.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/1/0429/4351/2732/files/beamforming_technology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/pakewi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5696/1438/files/77365223220.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/12365562947.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6520/5141/files/alcoolisme_chronique.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4488/1059/files/burford_capital_annual_report_2013.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3407/3505/files/les_bases_de_l_anthropologie_culturelle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9141/7495/files/xabexupibo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/bojetixokisav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2454/5949/files/zidasewugomosovipatalule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0236/3045/files/61649375148.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1483/8679/files/wizanawaso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9535/7595/files/caloric_value_of_food.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_off000069db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69DB 5636 bytes
SHA-256: 235b624df2d59cdffb14b3569cc3d04ebfd8f55d4d725510dc117851b1c43863
font_01_sfnt_off00007d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0D 10456 bytes
SHA-256: fa84ef502bf3f6fa1eeb17952dbc610415eb820aa198e580c2cb2a2c34849010

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