Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c868f8f3ed8bac3…

MALICIOUS

PDF

44.3 KB Created: 2020-10-29 08:34:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0c96d779bd3d226ab321c0094910ae94 SHA-1: 2a45d286a5e980c308a5edb2e0b39a5efd6165f8 SHA-256: 6c868f8f3ed8bac39987fd21460910da3892e0144a2c50153aa4adfe7dda8d03
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to a known malicious redirector. It also contains a large number of embedded links to external PDFs, suggesting a link farm or content hosting strategy. The ML classifier strongly indicated maliciousness. The primary IOC is the malicious redirector URL, which is likely used to direct users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=exit+status+137+%2528out+of+memory%2529 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/802517b2-feaa-4db9-86c0-1f6422188ea2/15345648638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff51045-8f22-469d-b34e-01c9ab1da67e/talida.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/definicion_de_calidad_iso_9001.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/bahai_feast_dates_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/3467/0790/files/rotexopoguvagatipelon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/9762/6021/files/97496929151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6a2d90-b86d-400d-906a-56e6dd5f5261/43975166296.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1653/3654/files/gerund_vs_infinitive_explanation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4727505-e8bb-477c-9c41-d89d7a9bbfb0/free_easy_piano_sheet_music_moonligh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2836019b-316a-4c59-bc0b-7c89af3dc7cb/93768052794.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/guzelupezoxaxotujobib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7070/8129/files/farming_simulator_2020_mod_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/8781548240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a5104b-300e-4b95-b945-20b731c7de7a/spirit_guide_sparrow_bird.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4372/3163/files/phallosan_forte_reviews.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2099/4720/files/34318646597.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/atlantic_revolutions_global_echoes.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/wewiditulexal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe9a211-a1c8-45e0-86c1-284abeb678a4/nexalobolegodove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156a369d-fa2f-456f-8caa-3d10d218c691/zodurudisezesikuxegupes.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/lijevudavuxekufagorilu.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/zezimovex.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_off00006b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B89 5460 bytes
SHA-256: f2a04d701f1d5d05faa55a3fddc44487c526238fbb1372901239157640340990
font_01_sfnt_off00007e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E31 11156 bytes
SHA-256: 820dde4a7e9769652bf4ca8e1c7f243e6ed8992c93027f349bc898286745e8d7

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