Malicious PDF — malware analysis report

Static analysis result for SHA-256 823fad78db755e55…

MALICIOUS

PDF

61.1 KB Created: 2020-08-22 02:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6a473bafb11a893ecfe5055ca85332ef SHA-1: 2ada54b67a19308f5ebf811740647b0424151ab7 SHA-256: 823fad78db755e5579a414da441ee4ae999ab508e15d39d41b1dae7f19becc10
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, with a primary URL pointing to known malicious infrastructure. The document body, though partially corrupted, contains text suggesting a lure related to a 'socomec atys d20 manual' which aligns with the SEO redirector's keyword. The embedded URLs are designed to lead users to potentially harmful content, likely for phishing or malware delivery.

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=socomec+atys+d20+manual In PDF document text
    • http://favukaf.lexialearners.com/uploads/1/3/1/4/131438397/985cd5b.pdfIn PDF document text
    • http://files.kelleygrantbooks.com/uploads/1/3/1/8/131856919/busemawen_jabam.pdfIn PDF document text
    • http://files.healthyvasquez.com/uploads/1/3/2/8/132814276/sumenikulutib.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/1/0428/6224/8102/files/delitadokurexamutuze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6056/0021/files/muvusuxasegibewulokumu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4346/3074/files/16374263389.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7468/0987/files/54235974345.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7968/7587/files/9487941803.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5812/6245/files/chander_pahar_bengali_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0862/1719/files/abnormal_psychology_barlow_8th.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1423/2996/files/vonenirubesajaxuga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5875/5749/files/building_design_and_drawing_book.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_off0000b139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB139 5468 bytes
SHA-256: 2178ab0ca83f030c97bc33e916552f21d53902fce7b1948a44c11e8025e0462f
font_01_sfnt_off0000c3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BA 10540 bytes
SHA-256: 372d892618b7cff2bfd44d314c12cfbd73f22e62ebb92dd03f663b740531d6aa

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