Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffcf81d8443c4f7…

MALICIOUS

PDF

43.1 KB Created: 2020-08-12 10:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c1cd204b58cd2f32d5038001c1291b03 SHA-1: 1aeeb1ee1ab614cefeaaff943b950c9d04d1509e SHA-256: 6ffcf81d8443c4f74d778697a5c77684115a1e7c48519bb3ee1637163f326aad
202 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though obfuscated, contains text related to 'account receivable cycle pdf' and includes the primary malicious URL, suggesting a phishing lure. The presence of multiple PDF links, many pointing to Shopify domains, indicates an attempt to create a link farm for SEO manipulation, likely to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.com/pify?keyword=account+receivable+cycle+pdf In PDF document text
    • http://rigosika.laurenlrogers.com/uploads/1/3/2/6/132696212/sebero_wupikituvo.pdfIn PDF document text
    • http://files.franciscanfoundation.org/uploads/1/3/1/4/131438509/841a2d01ef1c.pdfIn PDF document text
    • http://files.daisysaywhat.com/uploads/1/3/1/8/131872286/054f929986e3.pdfIn PDF document text
    • http://files.theartsparkle.com/uploads/1/3/2/7/132740339/vuxamunolal.pdfIn PDF document text
    • http://files.acorridor.com.au/uploads/1/3/0/7/130775747/suwukaletajov-futuxivunu-kudumeduliwi-fusim.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/1/0428/2312/3100/files/dekivuwixetolamosowobu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/4558/7877/files/action_research_project.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5761/7823/files/66482191309.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/anthropometrics_data.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9141/7495/files/sonic_rush_adventure_rom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/pearson_physical_science_concepts_in_action.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/wozujapotubikitenujuso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/545838458.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4526/5318/files/jajajewe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5197/3794/files/tuzoro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5306/3063/files/tapowufababapazotomele.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
🗂 Part of campaign: acorridor.com.au 3 samples

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC1 5264 bytes
SHA-256: 5f1770d9966ae206e2f43bf564c5de5b05e2c047735d6b52ef4da57452555bd8
font_01_sfnt_off00007cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB7 10236 bytes
SHA-256: 6a59863d74e46b0716c9cfb149d120b02f5f053c98fc8645445c43aab13bed52