Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffeb685d58570f2…

MALICIOUS

PDF

47.2 KB Created: 2020-09-01 06:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ab0d10f3339f34eaaf06c885f0b40aff SHA-1: 914907c330089265b6f10a718c3c6b1ea50cb4c1 SHA-256: bffeb685d58570f2d2ca6f720c452de05ba0efee8ae56898ed93e8bfe75853a6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised with a search query related to 'lesson 10 congruent triangles unit test answers'. The document also functions as a link farm, directing users to numerous other PDFs hosted on static.usrfiles.com and cdn.shopify.com. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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/wix?keyword=lesson+10+congruent+triangles+unit+test+answers In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/9904c2_c8490d1ccd794159a72ee781543bf8a6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c345b0_a8ffb6b2c8044abd92eed0440c493555.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/299074_b68fb3d0ef6e4244b52259c68aaeb0e5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_bf659a71aaa34ad3a48213a523a3f530.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2c7c49_0e8fdd601ac64c9fad955acb832b7897.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4352/0665/files/20517698159.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/83195799746.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0012/6885/files/jizuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/medical_cases_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2729/2582/files/amnsie_globale_transitoire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/19154587182.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8381/7375/files/bcbs_auc_appeal_form.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_356757b73cb642b19deb0bff8ac64bd6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bdeb4c_ba154473300743f58ba9d4c4d81a6eda.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/90c678_d2b0b3d93d594e4da202a9243e4a116e.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6452 5192 bytes
SHA-256: cdcf8c8a700c267c4339b272b464e54ae82f38909b439a7e2e4b4e731f8a62e8
font_01_sfnt_off00007625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7625 10540 bytes
SHA-256: 63d5f453cde67651ca0daf836a4913c0ae4d28a6ae331e0816172cc3600d501c
font_02_sfnt_off000099f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99F2 16208 bytes
SHA-256: 2cc36779403287548c184605c5d9ac9f8e39fd5c9622849292a4135ce18498ed

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