Malicious PDF — malware analysis report

Static analysis result for SHA-256 28135557f73ce010…

MALICIOUS

PDF

53.5 KB Created: 2020-08-12 09:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0b6081c8684d5b11ff03535fa476dbdf SHA-1: 904b8878eb668e965c72c18cba4c7093162e9dce SHA-256: 28135557f73ce010e4360f21b8b78ce65a4a58e63f122cb7793662ce1656b930
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text and a URL that mimic a maintenance manual to deceive the user. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a phishing lure delivered as a document attachment.

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/wb?keyword=hp%20elitebook%208560p%20maintenance%20manual In PDF document text
    • http://files.amandabrett.net/uploads/1/3/1/4/131482864/5243918.pdfIn PDF document text
    • http://files.mcnairy.com/uploads/1/3/1/4/131454373/tugogavekofawez_sekoke_damapu.pdfIn PDF document text
    • http://files.leclairecre.com/uploads/1/3/1/4/131437941/9933a8d3.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/1/0432/1109/6221/files/2079690909.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/kuvadorodufusenok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0118/3397/files/employee_attendance_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8748/5342/files/18224674924.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/watanunonuxomobeluvopa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/jasuxagebe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4210/2679/files/le_retrait_des_actes_administratifs_unilatraux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mejamuzeditika.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6761/3082/files/gipezotalewil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3396/0341/files/25767008985.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/58694370521.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2665/3079/files/2931169329.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/1334164548.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00006347.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6347 11740 bytes
SHA-256: d48245c73fe31178a46867cf809984e3af241edee2172d082b188eec6d68a0ac
font_01_sfnt_off000089a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89A1 5584 bytes
SHA-256: 897bfcb57ac3ef7f5283a63dad9d802cc28263a2c7f660db8fd17ca088a6afa8
font_02_sfnt_off00009c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C88 13684 bytes
SHA-256: 1a7fc7db0aae5f87c301b0f58a370e626488f6fc4cac151bc01f9fc94caee278

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