Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a7d77ae8bea591…

MALICIOUS

PDF

40.5 KB Created: 2020-08-06 19:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: defa4a2d01c5368a585853a886c30f14 SHA-1: d8c3c8018057e1a610bd6be0ab6d5fd6dd768b31 SHA-256: 22a7d77ae8bea5917ce1b7e362b1e186acc0b48b58ab6c1bcddc27ff2ea92bd2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a direct link to a known malicious redirector, indicating a phishing or scam attempt. The document body, though partially corrupted, contains text related to 'difference between plant cell and animal cell pdf download' and a URL that further supports the lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of the payload.

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=difference+between+plant+cell+and+animal+cell+pdf+download In PDF document text
    • http://delip.derekkalp.com/uploads/1/3/0/8/130874317/502f768cf.pdfIn PDF document text
    • http://files.nadiahgoff.com/uploads/1/3/0/9/130969452/nonuf.pdfIn PDF document text
    • http://lokekutus.moparsunlimited.net/uploads/1/3/0/8/130814124/tediwinolosaxe.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/1/0431/7675/5349/files/64485915850.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lewajoranuputefikilos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/83674147978.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/76436761717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/laluluzisimivomaxogabodiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4258/5241/files/nifud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6963/5734/files/91033882240.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/buditulegefabipipafakuni.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: derekkalp.com 3 samples

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_off00005f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F80 5356 bytes
SHA-256: 9339103cfdcb8de607536738d65c1db7a330dd6d05e0ad8850c166465f6112b3
font_01_sfnt_off000071b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B3 10600 bytes
SHA-256: 99fd8c2f96fefca8e1225e9eecc77ecbd3fcbb0ae6975eb9f52dcfdadedfcebb

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