Malicious PDF — malware analysis report

Static analysis result for SHA-256 38faefa9e4b5136a…

MALICIOUS

PDF

40.4 KB Created: 2020-08-15 05:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7a437ddf835e5598fb11bc21a4d9b001 SHA-1: 918f0d7447b4134401554dfe571fc272242aa1ce SHA-256: 38faefa9e4b5136a01e7f31449cacc683700c4c2e3799808b642cb270509b547
194 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'sklearn classification report recall' and the malicious URL. This suggests a lure to trick users into clicking the link, which then redirects to malicious infrastructure.

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=sklearn+classification+report+recall In PDF document text
    • http://files.gracesnh.com/uploads/1/3/1/4/131438330/mebetaz_vevodaj_xesonojazipo.pdfIn PDF document text
    • http://xiduzopo.silverfernflag.org/uploads/1/3/1/6/131607062/d44071.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/1/0428/1863/3894/files/zujopor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3517/2770/files/burning_love_season_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5341/5576/files/88560600032.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8597/1110/files/89721174812.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0574/7095/files/victorious_april_fools_blank.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2764/4072/files/kisuxazafugedan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2816/9383/files/cs_go_settings.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1599/4529/files/gefanajijawulenuwogojo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8652/8155/files/jukadivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9641/6157/files/29547654655.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7063/5678/files/35237710281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7793/5005/files/vovupora.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59FB 5176 bytes
SHA-256: 4af83a6078a65ead94bc56837bfd95ac3704cdf9b7befe1da01edf4471efb05e
font_01_sfnt_off00006b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9E 12728 bytes
SHA-256: 2c1f746b7264451bcd9f6a5059aaad094e8df19b6a242bcc203237c1b7801e3a

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