Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8edbb6f41698cd…

MALICIOUS

PDF

42.4 KB Created: 2020-08-25 09:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 86278c7ea877002ccd378d5108c0b306 SHA-1: 1ac8d28fd57dc1e91a4ed12e662cad0f5ac25737 SHA-256: bc8edbb6f41698cdc6f1f63d71243dcda8eaac31b29f9f7fd2e7ac99a96e0527
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 of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector, 'ttraff.ru', which is presented in the document body as a 'balancing equations worksheet part 2 answer key'. This indicates a social engineering lure to drive traffic to malicious infrastructure.

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=balancing+equations+worksheet+part+2+answer+key In PDF document text
    • http://files.myadminonthego.com/uploads/1/3/0/8/130874148/wusozokanivuj-vidoboziriso-wopanu-borobov.pdfIn PDF document text
    • http://bemuvuma.pslhsband.com/uploads/1/3/1/4/131437709/ed1454bd39ce77.pdfIn PDF document text
    • http://files.shamanmods.com/uploads/1/3/1/3/131379724/9a8a4b1707ddbbf.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/1/0437/9095/8749/files/xopiwadekifew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4518/9792/files/algebra_1_common_core_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1959/7981/files/hardest_naruto_quiz_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/82763756762.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2703/7336/files/10th_tamil_sura_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/occupational_health_and_safety_act_regulations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4181/4693/files/jubidomivaradutazox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0860/4829/files/51516680100.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5407/9910/files/estructura_del_texto_argumentativo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8161/9861/files/axis_allies_d_day_rules.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3754/7929/files/aa_acceptance_prayer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/vewikofo.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_off000063ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AE 5760 bytes
SHA-256: 3ebf66d54b072f91674a822bb447d70999e6d7b90096c989f37f3f067b43d554
font_01_sfnt_off0000775b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x775B 10924 bytes
SHA-256: 9fd65df51de9c6864de091f559689c0d4b5e50375b7fe23f8f9454e0cbefb140

Open this report in the interactive analyzer, or submit your own file for analysis.