Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7c4bb866ff2d22…

MALICIOUS

PDF

43.7 KB Created: 2020-10-01 00:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 09489fdd0edf3c6ff480919120be9d4d SHA-1: d0bd3dad4df935ab08103a42501a388628adbf0f SHA-256: ac7c4bb866ff2d22ecdb6d3028270eeea44366c8fa41fef5f62042499e5225e6
184 Risk Score

Malware Insights

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

The PDF contains a large number of links to external PDF files, many of which are hosted on domains that appear to be part of a link farm. One of the embedded URLs, https://ggtraff.ru/strik?keyword=analytical+method+development+interview+questions+pdf, is identified as pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the structure suggests a lure to drive traffic to potentially malicious or spam 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=analytical+method+development+interview+questions+pdf In PDF document text
    • http://files.refugegarnethillart.com/uploads/1/3/0/7/130739452/302ed2a00fb060.pdfIn PDF document text
    • http://files.nilessteamroom.com/uploads/1/3/0/9/130969458/b8ca9112c5d.pdfIn PDF document text
    • http://jewope.soundsofdevotion.org/uploads/1/3/0/7/130776007/3db9a0a22fb.pdfIn PDF document text
    • http://files.nataliehiningscenicdesign.com/uploads/1/3/0/9/130969663/zodojerirozibutolano.pdfIn PDF document text
    • http://zenufuvem.brennanfamilytree.info/uploads/1/3/0/7/130775229/712877.pdfIn PDF document text
    • http://files.terratravelers.com/uploads/1/3/2/6/132682640/dukapota_kofulatibenaj_zixos_fezodabodub.pdfIn PDF document text
    • http://files.thetastyturntable.com/uploads/1/3/1/4/131452836/15a008d.pdfIn PDF document text
    • http://files.queerconnectionlanark.ca/uploads/1/3/2/8/132816041/2470353.pdfIn PDF document text
    • http://files.creativeanimalsolutions.com/uploads/1/3/2/6/132696104/zoxepazerol.pdfIn PDF document text
    • https://site-1038765.mozfiles.com/files/1038765/gofamekugurosowopedewiwug.pdfIn PDF document text
    • https://site-1036699.mozfiles.com/files/1036699/wenerovamoxuvexuv.pdfIn PDF document text
    • https://site-1036946.mozfiles.com/files/1036946/50439720439.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://cdn.shopify.com/s/files/1/0439/1400/2587/files/glacier_national_park_ranger_guided_hikes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8747/0499/files/41550767340.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2742/1608/files/puwedodiwawomureboxipa.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_off00005d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6C 5644 bytes
SHA-256: 6730c14f8c36a21b5dff1c8ad61b5e670dfdd1357d2ae37de4ca494a0cf4c477
font_01_sfnt_off0000707c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x707C 10180 bytes
SHA-256: 0f00ded15ef3b882155a3692bfb7bce052816b2415e807ba5a75a7ec4ae65466
font_02_sfnt_off00009345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9345 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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