Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e53c9c81ce294d…

MALICIOUS

PDF

35.5 KB Created: 2020-08-21 10:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6122aa3452e847679ef55b900b04c5b4 SHA-1: cceb270aa0391e9cac069dd88a3ee82cf37c78b5 SHA-256: 16e53c9c81ce294d5beb67dcdeed679ac38c8c77b53e4292cc765f246da32740
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body and heuristics suggest a link farm designed to redirect users to malicious sites, likely for phishing or malware delivery. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=calling+rastafari+song In PDF document text
    • http://vawiwiro.northwoodsbulldogs.com/uploads/1/3/0/7/130739430/timamenibilinav_vuragilire.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/1/0438/0885/0081/files/pdf_accessibility_webaim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/zopebokudamiso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/marguerite_duras_the_lover_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/60491670554.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8447/9641/files/last_day_on_earth_map_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2315/4850/files/basic_australian_invoice_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5511/8501/files/28300209798.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9751/2354/files/samude.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/warugeliw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/71826309583.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/kikefakiserozesifodovifo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4537/0521/files/falatugifadisi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0271/4533/files/11021746742.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 1

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_off00004efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EFC 4840 bytes
SHA-256: cc6f62977a1c46b1c82b4cd5e97db49910d098bfd3c964b8be90171645036736
font_01_sfnt_off00005f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F80 9932 bytes
SHA-256: 096676f93091a557801d679f5d748a574114cace2e3b5afa4e5408040a07c246

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