Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2c00ba2b3b55e9…

MALICIOUS

PDF

41.9 KB Created: 2020-11-06 17:36:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5dddcbd8521f3797f6ecf35e57c8a94f SHA-1: e7a4d3fba3d04ba209047be02cacc6cd9991b153 SHA-256: 7c2c00ba2b3b55e917af3c98eb1986c493e64885ffdf6050806de431daf6da81
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious sites. The primary lure appears to be a 'free download' disguised as 'principles office life is strange', leading to the URL https://trafffe.ru/123?keyword=principles+office+life+is+strange. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest an attempt to exploit users through deceptive content, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?keyword=principles+office+life+is+strange PDF link annotation
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/selapekufen.pdfIn PDF document text
    • https://nipibodofabujid.weebly.com/uploads/1/3/4/2/134265940/gutoxoxe_karunomiviwo.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/6497588.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/words_that_begin_with_miser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9361e46d-5f04-4416-834a-68ac254d2a8a/sharp_aquos_remote_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/226219d4-77f3-476a-954a-167c2cb04d1d/68645841337.pdfIn PDF document text
    • https://taretapu.files.wordpress.com/2020/11/five_feet_apart_song.pdfIn PDF document text
    • https://s3.amazonaws.com/befevifa/acetic_acid_dissociation_ph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6df176f7-e8f5-44e1-97df-aff4e2b80faf/gutuwakazusepazikonide.pdfIn PDF document text
    • https://mubabibaxoz.files.wordpress.com/2020/11/bonezukugoweg.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6653 5184 bytes
SHA-256: e63605f77c62fef0433157bd50367bdc7032ca2e5f310ab047b9928b51b147c4
font_01_sfnt_off00007807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7807 10112 bytes
SHA-256: daae9cacd1008e003497ba3fc6bbe12e2996f4cacefa75be901b98c24c40cb90

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