Malicious PDF — malware analysis report

Static analysis result for SHA-256 edab9f9b1460cb8f…

MALICIOUS

PDF

42.1 KB Created: 2020-11-01 20:07:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6a1c000db977d594b60330ea3540539e SHA-1: 34ecc25e0b698259b83c71ac3ec8ea6beba438e5 SHA-256: edab9f9b1460cb8f6a7fe689f6b0dd0c84f82ff7fa872101897514b2bc3c5118
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to a redirector service identified as malicious. The document body and heuristics indicate a lure for a 'flappy bird apk' download, which redirects to the malicious URL. The presence of a large number of external PDF links suggests a link farm or SEO poisoning tactic to distribute the malicious content.

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://cctraff.ru/strik?keyword=flappy+bird+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414866/normal_5f97e0f076a7d.pdfIn PDF document text
    • https://bekarofadu.weebly.com/uploads/1/3/4/3/134346179/begugamujagosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f875068066cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5f9a8f2d27bbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_5f99335400a06.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/sutudotuvunekor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f894f36d9bc0.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/tosasugokod/posej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/5271/7982/files/hvac_maintenance_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dad283a-36b5-471c-90b3-36b612bf5e97/jamulujababonon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4562a998-cbc9-4883-b46a-ab732e9207d6/10912869817.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/pefidiwopel.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/equilateral_triangle_strongest_shape.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4951/5684/files/10th_class_english_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/catalan_chess_opening.pdfIn PDF document text
    • https://s3.amazonaws.com/bikebuduvud/58391241789.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3455/7602/files/ideas_para_empezar_un_parrafo.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_off00005a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A34 4412 bytes
SHA-256: 4eac4f28f337c9500a3904049c6dc111ab50f4847e4a342a2e448670ec5b33d5
font_01_sfnt_off0000692a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x692A 10740 bytes
SHA-256: 994df18898e01b06c8c82ab3326db23aabb9f5d42ad314780c542de14652cd2f
font_02_sfnt_off00008dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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