Malicious PDF — malware analysis report

Static analysis result for SHA-256 728797dd4fe3374e…

MALICIOUS

PDF

49.4 KB Created: 2020-07-29 07:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 69fcdc76b0bed0a75b85881c8dbcf851 SHA-1: e375d150db3900053463c87ce490db07a58b69db SHA-256: 728797dd4fe3374e6c527f83adb1271cbec7a6a431a7d63e3458af0d5a20e8dd
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting an attempt to drive traffic to malicious sites. The embedded URL and the document body, though heavily obfuscated, point towards a lure for free content or downloads. The ML classifier strongly flags this PDF as malicious.

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.cc/pify?keyword=mama+ek+peg+la+song+free In PDF document text
    • http://files.knit-a-square-southafrica.com/uploads/1/3/1/3/131379268/587716.pdfIn PDF document text
    • http://files.suicidepreventionuw.org/uploads/1/3/1/4/131407353/b48946230624.pdfIn PDF document text
    • http://files.bariatricketo.com/uploads/1/3/2/7/132741211/pamojuzoberinel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1100/4821/files/votiteso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/fixososotofuxuzisamunar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/76200408640.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8937/9996/files/45883157213.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/warulawojapawekukojo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0506/6913/files/99996860045.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5903401900.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/59371036774.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/gixidemujaka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/34649437932.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1362/5240/files/linirof.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E06 4948 bytes
SHA-256: 0eb77da35d3f232e6c852840901164083c1236e2ac212c17578b617b1b2a4710
font_01_sfnt_off00007ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC2 3244 bytes
SHA-256: 36368e01dab69d3511779f1ec8b8991215b18834b226712ec44f9096599f6b26
font_02_sfnt_off00008b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7D 14452 bytes
SHA-256: 305decbc4ad8ded041e6eb97da61e73d2583562695dcdc615537acd7fd887670

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