Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31915420e05f899…

MALICIOUS

PDF

35.1 KB Created: 2020-08-16 23:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3e501c82eeb7f9914387d06d56b828e3 SHA-1: abd40ca6b547f8aeff431d679f4ef50a8a552fbc SHA-256: d31915420e05f899bebe2c0e196fb27f4c694ce4520a435e12f4307d8a5bbdc5
194 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to a URL that includes 'promissory note extension agreement form' in its query parameters. This suggests a phishing or scam attempt. The document body, though partially corrupted, also contains this URL and numerous other links hosted on Shopify, likely part of a link farm to obscure the malicious redirector. The primary malicious IOC is the ttraff.ru redirector.

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=promissory+note+extension+agreement+form In PDF document text
    • http://diwuxikid.camdenspeedwaytn.com/uploads/1/3/1/1/131164066/143da60.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/1/0428/0372/4455/files/40532730035.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5672/5153/files/nusazipunorap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1612/6625/files/53970913441.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/ropupinogavapes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9719/2603/files/ssc_je_admit_card_2020_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2423/6199/files/67895369408.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/59507559978.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/0639/7337/files/54522337682.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0004/4454/files/test_credit_card_numbers_stripe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/54700132767.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 1

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_off00004aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AED 5228 bytes
SHA-256: b1e1599b581894683e9845db27918f0e7875d6c22c2e624d5edfcb3cc7bcd997
font_01_sfnt_off00005ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA9 10212 bytes
SHA-256: ed5431d02b964e9e3bf2147478a45893930306b65cb67a09192b7ddc7791a1a0

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