Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31c832ef5d6529a…

MALICIOUS

PDF

42.7 KB Created: 2020-08-02 08:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8a21b382c29be621413b5805c1ca0658 SHA-1: 5b0d26b3a246e6e90bdc6b5ea2ffc4c5f21637b2 SHA-256: d31c832ef5d6529ad6fb05dfd1b300990a05e46521037e783130c363e001b22c
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a PDF link farm. One of the primary links points to a redirector URL, suggesting an attempt to obscure the final destination or engage in malicious redirection. The document body contains the redirector URL, reinforcing its role in the attack.

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=u+nas+nsc+800 In PDF document text
    • http://files.portchestereyecare.com/uploads/1/3/1/6/131637136/9106054.pdfIn PDF document text
    • http://files.pieceworkjournals.com/uploads/1/3/0/8/130873769/895d8232a.pdfIn PDF document text
    • http://files.hihatdesign.com/uploads/1/3/0/7/130740231/nogevutenezotepu.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/1/0434/0632/7975/files/werorelot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3438/5303/files/87962743461.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7417/4632/files/rofabasosi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/9804634466.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8870/6717/files/wav_to_youtube.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/28603075132.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/84298729394.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6462/2246/files/12483196806.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wetitoditasenubekuxon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4381/4560/files/32978474659.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2219/5608/files/revelation_road_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7955/5486/files/94984422436.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 5

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_off000068fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68FD 4992 bytes
SHA-256: 2f5e683739ac7a4cf2e2e4fa40f63a55ac7344e463047e5acfeb1c319f688cb1
font_01_sfnt_off00007a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A09 10528 bytes
SHA-256: 13655de35b79462eec8add8855b94d6fd5c00f8744e7381c055da647e9b01077

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