Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2f49aa6a290142…

MALICIOUS

PDF

44.7 KB Created: 2020-08-09 23:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 305202ddb3859b1ae79c65372f3e3cde SHA-1: 85a74917a0a22ef4db53bacdbf57668f2da4e4c5 SHA-256: 4b2f49aa6a290142d5603181ffd944dfd3f66b249732894331d16e85d085d4d5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as 'Cambridge english advanced exams pdf'. This link, 'https://ttraff.cc/pify?keyword=cambridge+english+advanced+exams+pdf', leads to a link farm hosted on cdn.shopify.com, which in turn hosts numerous other PDFs. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains multiple external links, suggesting a phishing or redirection scheme.

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://ttraff.cc/pify?keyword=cambridge+english+advanced+exams+pdf
    • http://tipunos.chemungcountyswcd.net/uploads/1/3/1/8/131857920/7717774816a4.pdf
    • http://files.positiveposturenz.com/uploads/1/3/1/4/131483550/sivaf_polatafi_zuwovil.pdf
    • http://wakumu.earthquakeearlyalert.com/uploads/1/3/1/4/131437736/vesejeduxe-nubomobef.pdf
    • https://cdn.shopify.com/s/files/1/0432/6726/0576/files/collector_plates_value.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/zawidubimun.pdf
    • https://cdn.shopify.com/s/files/1/0432/3088/8094/files/dezufitizo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1918/9915/files/calendar_2020_uk.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/built_environment_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/zorufajebagukir.pdf
    • https://cdn.shopify.com/s/files/1/0439/2009/7448/files/10391508225.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/88046630813.pdf
    • https://cdn.shopify.com/s/files/1/0431/1479/1069/files/60340489061.pdf
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/jodojovojijuzavajejom.pdf
    • https://cdn.shopify.com/s/files/1/0434/1576/5148/files/username_and_passwords_nod32.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/58593656011.pdf
    • https://cdn.shopify.com/s/files/1/0434/7183/1193/files/moloferozi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006401.bin
28e23945d7beda1eb6801384494ee21ffcff8971a19e6d2e4ddb56063ca98812		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6401 5740 bytes
font_01_sfnt_off00007764.bin
ec789aa7f963f964c0849d3c2fd636606e6570e214da760f066a21f56eef7c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7764 9864 bytes
font_02_sfnt_off0000997e.bin
bb965ea0515e7499bb47638dd5c820c8824ea93d586ac0d8f4a8f758a0d32bc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x997E 3060 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.