Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c7e3d354d78b07…

MALICIOUS

PDF

50.1 KB Created: 2020-10-11 11:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 22ffbe30fe55b67924e7f247d12e2583 SHA-1: 3bec1a97c3c317529699ccdd8ea5fce27a7ca31e SHA-256: b9c7e3d354d78b078446501cca81230947161d5fd9088ca2ee6a1c4cd8288be7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely intended to lead the user to further malicious content or phishing sites.

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://cctraff.ru/strik?keyword=roles+de+los+grupos In PDF document text
    • http://files.mycyberphile.com/uploads/1/3/1/3/131398019/78513.pdfIn PDF document text
    • http://files.rachelcrawford.org/uploads/1/3/0/7/130739557/5d367a7ccaa3a4.pdfIn PDF document text
    • http://files.pamelafletcher.com/uploads/1/3/0/8/130873937/debawuniriwuwibis.pdfIn PDF document text
    • http://files.cerritosxc.com/uploads/1/3/0/7/130775654/684e2.pdfIn PDF document text
    • http://files.wewalktogethercharlotte.org/uploads/1/3/0/8/130814479/4875716.pdfIn PDF document text
    • http://gikoxun.406flies.com/uploads/1/3/0/7/130739173/figerafelusujej.pdfIn PDF document text
    • http://files.astorialogisticsgroup.com/uploads/1/3/1/4/131483343/kopuxov.pdfIn PDF document text
    • http://files.jjriverrun.com/uploads/1/3/0/7/130776720/6045406.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/1/0429/6556/5589/files/pugimefudab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5250/1658/files/jetepi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5919/0689/files/utopia_guide_nyc_spa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5589/2630/files/71735923674.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4732/1237/files/pofozamidokalapemujut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/565a0674-41ea-49a5-880a-d4d67cda18f6/xakaxuxumixazoxatokigata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34a32b3c-2a4d-4cf8-8c98-8fa6bb629609/58418011810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f6dcffb-a310-4a1b-a2b8-761ecc241468/28019677177.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_off000084bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84BB 4924 bytes
SHA-256: 0e8c58020829ad62e6dedd36905eb95dedda0cc65397d611b36d870bd76cea4d
font_01_sfnt_off00009593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9593 11264 bytes
SHA-256: ea56aa27522b93a04e1909fee1e274a24a2f7883fd116b7c54ad7b62b589f62f

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