Malicious PDF — malware analysis report

Static analysis result for SHA-256 936a7bfaeb33fe21…

MALICIOUS

PDF

45.2 KB Created: 2020-08-25 03:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6c10f81ed2f31681d0ee9f970aa42d0f SHA-1: c9ca50f658efa6fdacca62372f5779983c9f1010 SHA-256: 936a7bfaeb33fe21103377d6588e71c2ca73c6c40a2b3a88032e8c215e776b13
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, including one pointing to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains text related to 'apset 2018 question paper with answers' and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of a link farm heuristic further indicates an attempt to distribute malicious content or traffic.

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=apset+2018+question+paper+with+answers In PDF document text
    • http://vanokeni.dandelionkisscustomphotojewelry.com/uploads/1/3/1/3/131383744/vujegekubofojer.pdfIn PDF document text
    • http://files.mindforyouth.org/uploads/1/3/2/7/132740814/pisoxebagalepanik.pdfIn PDF document text
    • http://files.integritycincinnati.com/uploads/1/3/2/7/132712325/2031551.pdfIn PDF document text
    • http://files.thewanderers.org.au/uploads/1/3/1/6/131607331/5a692599d.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/1/0437/6294/2101/files/financial_accounting_multiple_choice_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0281/4876/files/attachment_style_inventory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9558/9013/files/nuvuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9494/0575/files/anestesia_local.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9531/6896/files/tumaczenie_z_angielskiego_na_polski_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2529/1674/files/15253027912.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74535711799.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8035/8815/files/sowukifudipejutazefajo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7863/2095/files/zitapisaramafubu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6055/9013/files/15355922456.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/pezuwagabawasiwokituxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/laregixowovanusazodus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/69501204155.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4098/8575/files/canadian_immigration_form_5257.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D26 5600 bytes
SHA-256: 6d0f9c0f1003e56047a6b74f816ec431b4b3c05f6c7b2a01b8764dc533167062
font_01_sfnt_off0000803e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x803E 12592 bytes
SHA-256: 44d00b45148e628856cae0cc1e1c881d301e206cb15d9df30c9fe22e04062866