Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8451c34f0445173…

MALICIOUS

PDF

49.0 KB Created: 2020-10-09 07:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ba7aa47b184110dc0907cf6bc8493799 SHA-1: a61362fdf4ab2a9f71a04ee88dd3d07901d8de32 SHA-256: a8451c34f0445173f961c82110da9214c401e467ff07e54bc89205abaca35ec6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to generate traffic. One prominent URL, 'https://gettraff.ru/strik?keyword=lifespan+david+sinclair+pdf+free', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure under the guise of providing a free PDF. No scripts were extracted from this sample.

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://gettraff.ru/strik?keyword=lifespan+david+sinclair+pdf+free In PDF document text
    • http://falexoto.studio50artroomexpress.com/uploads/1/3/1/4/131454762/4911318.pdfIn PDF document text
    • http://xezepade.rcdavis-tellinstories.com/uploads/1/3/1/4/131438379/f42eaec.pdfIn PDF document text
    • http://vokigodi.laroaevents.com/uploads/1/3/1/3/131398054/vugigizaz-wizuwisijeza.pdfIn PDF document text
    • http://vasuzos.crestridgefarms.com/uploads/1/3/1/6/131637136/perofozaguwepetoleg.pdfIn PDF document text
    • http://files.mariuccivideo.com/uploads/1/3/1/3/131381204/4438973.pdfIn PDF document text
    • https://site-1048275.mozfiles.com/files/1048275/gunatap.pdfIn PDF document text
    • https://site-1042187.mozfiles.com/files/1042187/84621765214.pdfIn PDF document text
    • https://site-1043477.mozfiles.com/files/1043477/jusunonoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6007/5930/files/jedepudusiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3735/0296/files/23327052239.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3262/4797/files/storyblocks_free_trial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1342/6333/files/29519509896.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5088/4008/files/juwevekawe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7847/6195/files/ep_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2818/6789/files/plant_cell_labeling_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1409/3986/files/yamamoto_bankai_name.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E58 5148 bytes
SHA-256: 37f38c3fbb192fb47e3a0d6a528238ec8e45060ed04e49462c08516c28b43d8c
font_01_sfnt_off00007fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FED 6856 bytes
SHA-256: 439f781798a03aa8b10cb5ed9c01527bcd598f9982b6ef1ece7de1eb213bdc88
font_02_sfnt_off00009281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9281 10624 bytes
SHA-256: b607a1a09ad7e555db3e9a559f49bf4130614de0c688244665640843aed61fa7

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