Malicious PDF — malware analysis report

Static analysis result for SHA-256 af35c8933f15dfd5…

MALICIOUS

PDF

47.7 KB Created: 2020-08-02 15:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 04999206f6b69a794a9446c436fe6038 SHA-1: 9267b9c4ded610a0cd46f3806c3f6049eefed9db SHA-256: af35c8933f15dfd56c8a0f19a1d3d8809d1a5376572264ab53d22fe2da6e4f82
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Uky gpa calculator' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=uky+gpa+calculator In PDF document text
    • http://files.studio-knox.com/uploads/1/3/0/7/130738921/3eda0.pdfIn PDF document text
    • http://files.talleir.com/uploads/1/3/2/7/132740930/mamasazaleka.pdfIn PDF document text
    • http://files.patriciaagupusi.com/uploads/1/3/2/6/132681579/517f0e73.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/fizevobiriwegibodos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6803/8049/files/82216709552.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/55064184510.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30347825404.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7437/8138/files/11402780553.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/77533374077.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xasojikunu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/temufaxilagig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5601/3205/files/xofidekaguwomipoborifo.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 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6557 4692 bytes
SHA-256: d2a767771df11563d07addb837e581619541f60260b84b19bd6c6bacfea7291a
font_01_sfnt_off00007568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7568 14944 bytes
SHA-256: ec361b0c4c9324a575ead71778570ae192b8909161a7ee81511c4fca76d23657
font_02_sfnt_off0000a419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA419 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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