Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb267106675492f…

MALICIOUS

PDF

81.2 KB Created: 2020-08-14 11:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5e1c50dc41a00d0326076f8386f4dfa0 SHA-1: 305f9dff01996823128e42795291a3de7c526390 SHA-256: efb267106675492f075c0041ffa601b1b99e51ac01c15afb5e81db22afdcb03f
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text that appears to be a lure related to a worksheet, suggesting a phishing or malware distribution attempt. The presence of a malicious redirector URL is the primary indicator of malicious intent.

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.ru/pify?keyword=phyzspringboard+the+em+spectrum+worksheet+answers In PDF document text
    • http://files.more-cb.com/uploads/1/3/0/8/130813698/1979749.pdfIn PDF document text
    • http://files.1817.co.uk/uploads/1/3/2/6/132681317/e457965e8c4.pdfIn PDF document text
    • http://bimom.pemun.org/uploads/1/3/1/4/131438667/demabuxozofex-ruvozed.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/1/0430/8933/0330/files/dell_supportassist_uninstall.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4259/5239/files/popusupugirikov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6145/8597/files/bbq_smoker_recipes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3896/4903/files/jalunupimabureti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1416/7450/files/what_is_the_plural_of_mongoose.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6222/9157/files/vocabulary_family_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/zufuvodabod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8946/8328/files/my_best_games_of_chess_alekhine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0577/9878/files/wurerunuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/37903879595.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8237/5577/files/lopamuga.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_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 5904 bytes
SHA-256: 589fa7603705ab30f9b8ebd1268723c46a95649e6f838a6dfa9dbe0ca5cf7f83
font_01_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 11628 bytes
SHA-256: a4d746c38d99fde8e80552d54d4557a92ef7cd2e87536b38e7d355fc1066096e

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