Malicious PDF — malware analysis report

Static analysis result for SHA-256 f438a6f294635a77…

MALICIOUS

PDF

46.3 KB Created: 2020-10-05 14:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cffffe7ce8efa4950a2e08a94bddf892 SHA-1: 9982ef96a0ce306cef554643232ed7d492d4f48d SHA-256: f438a6f294635a7777457bb2ef5087d395ed00d8af1353243a413eab6ea741ab
194 Risk Score

Malware Insights

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

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 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=warframe+sand+of+inaros+quest+guide In PDF document text
    • http://files.southmountaintrail.org/uploads/1/3/1/0/131071164/836810.pdfIn PDF document text
    • http://files.saltwatersurfart.net/uploads/1/3/1/6/131607467/b21f2705.pdfIn PDF document text
    • http://moweg.hardawayhighband.com/uploads/1/3/0/7/130776716/lifutimetepi.pdfIn PDF document text
    • http://files.danielwalcherrealestateservices.com/uploads/1/3/2/3/132302718/muwovolomuderagenipa.pdfIn PDF document text
    • https://site-1036724.mozfiles.com/files/1036724/firomujodu.pdfIn PDF document text
    • https://site-1039777.mozfiles.com/files/1039777/50541979982.pdfIn 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/1/0429/7955/7539/files/valaponozajoguled.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6074/3329/files/red_kote_gas_tank_sealer_oreilly_auto_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4116/8801/files/69619538740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0054/9535/files/accounting_chapter_8_study_guide.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_off000077d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77D5 5336 bytes
SHA-256: 2424b6dbd129e486d5b890dc95664b437356e928c8df283501c502acba42435a
font_01_sfnt_off000089e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E9 10156 bytes
SHA-256: 50cfac0be0528781e6d5a33a0ea8fc5d52bdaf94bb66361fd6982007e2cd4aa5

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