Malicious PDF — malware analysis report

Static analysis result for SHA-256 850af620af77de46…

MALICIOUS

PDF

39.8 KB Created: 2020-08-03 10:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cc8854f665b97e2758d0dcfb189c375b SHA-1: d7fdbc720ccc4e81049c97435d60672f8036afce SHA-256: 850af620af77de464782ca27fb7c0d22daef71ee87a40ada133b1c1b6f95d223
202 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, including a redirector URL identified as malicious. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading a payload. The document body, though heavily obfuscated, contains the malicious redirector URL, suggesting it's part of a phishing or malware distribution scheme.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=psiphon+pro+handler+apk In PDF document text
    • http://files.kimberlydeanne.com/uploads/1/3/1/8/131856664/xuzonefuwe.pdfIn PDF document text
    • http://files.yummyandcompany.com/uploads/1/3/2/7/132712093/kaxesatasetete.pdfIn PDF document text
    • http://files.missrosieweddingsandevents.com.au/uploads/1/3/1/4/131453194/0cacec15fe3.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/1/0430/9018/2297/files/51123302216.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/15297263472.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wugituvunajobi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/98885451544.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/xagofu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9724/1240/files/kotegefokolasodipinu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73768917897.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/liwuweravizena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/66269234465.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7978/5886/files/53758436256.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/21578790193.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 6

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_off00005d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1C 5112 bytes
SHA-256: 6652a77e034e3f6ac7624a6be4b30e345ae2673a738e663ee600243cefc24fbf
font_01_sfnt_off00006e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E75 11524 bytes
SHA-256: 595084a024154802f141437e008da1efa4de67172d55f4ab4801af85ef53d6f7

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