Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea86c93e23208165…

MALICIOUS

PDF

37.4 KB Created: 2020-11-04 15:54:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b3540fc25885fd2ec3f43cfc50f60126 SHA-1: 4ae53116c324f1f83ae4e4037edf8101f709ac2f SHA-256: ea86c93e23208165b181ecd239f13b8193161756e45d4624ebac7603311feda5
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector domains. The document body, though heavily obfuscated, contains text suggesting an educational lure ('Collective nouns worksheet grade 3') and includes the primary redirector URL. This indicates a phishing or scam attempt designed to drive traffic to malicious sites.

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://gettraff.ru/strik?keyword=collective+nouns+worksheet+grade+3 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_5f9b287431e3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_5f9d6233b7258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5f94bf60a0fdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_5f9911f2e2472.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/1515306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403539/normal_5f917a7b0917f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5f985b7cda991.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/46fc7defa5a7.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://s3.amazonaws.com/tedowafomaru/encyclopedia_judaica_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/como_rezar_el_rosario_catolico.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/selujoli.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4665 5484 bytes
SHA-256: a81601b4f8d15e4548b42a4f34911abf2ac2a214d7886d3e3dd7e483c8ea2703
font_01_sfnt_off00005914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5914 9892 bytes
SHA-256: 727de278f7a51f84c7a32b2aa74bb3a90430bbbae500ff9de73c68a9b63a1e65
font_02_sfnt_off00007ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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