Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8d969754d7390f…

MALICIOUS

PDF

88.4 KB Created: 2020-07-22 18:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a2b71dbc9afca98b234824f5168d62cc SHA-1: 94160e139e0605a8b97789818a422347638831be SHA-256: 5c8d969754d7390fb38cd5f633d0e44cec9b118fc222aaf17bd45df20cf61422
194 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a free download for IELTS materials, but it redirects to a malicious infrastructure. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to distribute malicious content or phish users. No scripts were extracted, but the document's structure and embedded links point towards a social engineering attack.

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=makkar+ielts+speaking+jan+to+april+2019+pdf+download In PDF document text
    • http://files.oursaviourchurch.org/uploads/1/3/2/7/132740804/dujugiduxetigi_kabed.pdfIn PDF document text
    • http://files.louannbauer.com/uploads/1/3/1/3/131380627/6022787.pdfIn PDF document text
    • http://files.oconnorselectrical.com/uploads/1/3/0/7/130740193/7281101.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/1/0428/9835/8432/files/38659434623.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/57619212517.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1028728638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdfIn PDF document text
    • https://dakenoxuw.files.wordpress.com/2020/06/tejapora.pdfIn PDF document text
    • https://nitapid.files.wordpress.com/2020/07/fujasumutikisizob.pdfIn PDF document text
    • https://daritawaba.files.wordpress.com/2020/07/mejinaputope.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3182/2485/files/25015313003.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/bevuvujuwidolesoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/kipinamivuwovi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8135/1839/files/28933713191.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26225030347.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/womekomukuker.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 4

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_off00011c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 5716 bytes
SHA-256: ee6b95c2d6c75428ebc20b639f3ec53e3ce438ed05aae9e6579921f4f70f19f0
font_01_sfnt_off00012ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFA 10408 bytes
SHA-256: 3796d1d1c3b46455bf01bd13263bcab79a4489ee70577ca7c976da637be2414c

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