Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5533a3c28578ba2…

MALICIOUS

PDF

73.2 KB Created: 2020-10-13 15:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6dfdd4c1bb1f9f790da0e5b4bfb688d6 SHA-1: f720d945bb6f501c0b52aee8b230d21537b750af SHA-256: f5533a3c28578ba2bc53064e1899928a65cea3261e8905dd6eee3403ee10c3f1
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ggtraff.ru/strik?keyword=flavio+josefo+antiguedades+judias+completo+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8889/6415/files/92009783716.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/9555/1903/files/11082055796.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/guruvig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4979/7790/files/tarelavovegisapema.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6993/1172/files/mass_of_a_joyful_heart_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/6280/8742/files/91130047555.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6826/7423/files/dark_souls_ii_collectors_edition_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7617/2958/files/xogotas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9820/5077/files/deutsche_bank_national_trust_company_florida.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3965/7631/files/cleanmymac_3_license_key_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1b4cab-5fa4-4e00-88ef-058d3d7aaac3/masapifativabubefefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8f3df0-31f2-4248-a6ad-966b42a542b2/gofibusojonejovejiwebev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a14e2e34-99f1-4288-8eb5-fea678d64365/tenunikotupolajotatuxuvox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/9941/6485/files/nigepodes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7840/8609/files/71949492603.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9994/7162/files/clever_cat_litter_box_images.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_off0000d382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD382 5468 bytes
SHA-256: b2ac06295b1eaa03507f93e5aea5d00d40c622b78dbc2978280260cfb0d1fb41
font_01_sfnt_off0000e624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 15304 bytes
SHA-256: c7fbec03cf194cd891de17fa245bc29a1c0df07f54d685df898748cb712ed80d

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