Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b391731a573041…

MALICIOUS

PDF

37.4 KB Created: 2020-08-17 18:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2ff685f8bdc51df19ad27d822ec2e223 SHA-1: d4fa2c19a508a9d740fa36959530d1a117fd4d5f SHA-256: 71b391731a5730418c76be1e081120d736c986dec918c93d995199f0ee6abefa
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a title suggesting it provides answers to a correlation vs. causation worksheet, but the content is heavily obfuscated and contains numerous links. One prominent link, 'https://ttraff.cc/pify?keyword=correlation+vs+causation+worksheet+answers', points to a known malicious redirector. The presence of a large number of external PDF links, many of which are benign Shopify links, suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the PDF structure and embedded links indicate a malicious redirection attempt.

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.cc/pify?keyword=correlation+vs+causation+worksheet+answers In PDF document text
    • http://files.distantfin.net/uploads/1/3/0/7/130775734/pamofasusure.pdfIn PDF document text
    • http://pufurib.brianmoskin.com/uploads/1/3/0/8/130813108/renesuv_xinot_wizuvunosilabo_dozebisazuv.pdfIn PDF document text
    • http://dogekal.malikwork.com/uploads/1/3/2/7/132710712/9511409.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/1/0448/1554/8573/files/lil_shop_of_treasures.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5651/9578/files/upsc_ifs_botany_syllabus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8715/0752/files/79178668914.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/bipolar_disorder_patient_case_study.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/2903556348.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9930/6648/files/application_letter_for_ojt_sample.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1961/6935/files/54148325348.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/50660523633.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0421/4942/files/29563144735.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9764/4449/files/94826402579.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/77012045602.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_off000055c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55C5 5008 bytes
SHA-256: 7499fd5aef42de56b2f27731c5d0832b9659e1708c8c1460d8cc10c9b60044cb
font_01_sfnt_off000066d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D5 9904 bytes
SHA-256: 5105b2be2037d2571941fa76627edaf69d3bfc426d9278b5cac42f9108c99783

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