Malicious PDF — malware analysis report

Static analysis result for SHA-256 21520a141fb283d2…

MALICIOUS

PDF

55.5 KB Created: 2020-08-28 15:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 57e7b33e7f15aaf87f8e6685efd309ff SHA-1: 8807724f4cf6d95aaf5eb1052c1e8f6905eccb26 SHA-256: 21520a141fb283d2f5ed82c32880a40cfdfa1a2586f60747a4620fe08b31873c
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm, with multiple embedded URLs pointing to external resources. One of these URLs, 'https://ttraff.cc/pify?keyword=server+2012+keys', is flagged as a malicious redirector. The document also exhibits social engineering tactics, instructing the user to press Win+R or paste a command, which is consistent with ClickFix attacks designed to bypass macro restrictions. No scripts were extracted, but the presence of malicious redirectors and the social engineering lure strongly suggest a phishing or malware distribution attempt.

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=server+2012+keys In PDF document text
    • http://rexiv.socratessolano.com/uploads/1/3/1/4/131453494/3585935.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/1/0430/6577/0133/files/vexenene.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/7135/7347/files/chinchilla_care_information.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8892/8150/files/marriage_certificate_form_pakistan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8941/9676/files/isfas_sede_electronica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4854/2109/files/semuzev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9436/7649/files/xerostomia_causas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/davojabedurubuniku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0615/6190/files/clases_de_piano_para_nios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0583/6444/files/80105193262.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/kitifinuzanufofinuwex.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 2

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_off00009ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC5 5092 bytes
SHA-256: 27d7037d4e771e4c3e59d4cc92fa11a2a44607609864bff2a3a34429ae4d701a
font_01_sfnt_off0000ac45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC45 11420 bytes
SHA-256: 65f4907bcef6c8e5302cf0251c5a97827c925bf37cc869be0ba64bb6343221d6

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