Malicious PDF — malware analysis report

Static analysis result for SHA-256 8447cc1b3d25e328…

MALICIOUS

PDF

50.7 KB Created: 2020-08-25 03:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7afd656c26b02460477872c9d137e4c SHA-1: cb24330b3980cf12e955fba22f096673c02ff267 SHA-256: 8447cc1b3d25e3285bcb3ee5e76045edf24cfa87f7ba05acdc71ac526529ab13
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains the text 'Pc full form in police department' and the malicious URL, suggesting a lure to trick users into clicking. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many hosted on shopify.com, which are likely part of a link farm to improve search engine ranking for malicious content. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=pc+full+form+in+police+department
    • http://delik.carpetcleaning352.com/uploads/1/3/2/6/132682989/ropefemeretesov.pdf
    • http://files.bestoftimeswatch.com/uploads/1/3/1/3/131379749/e4facd24be.pdf
    • http://files.sarahspetals.com/uploads/1/3/1/3/131382092/385584.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/migoxepixixukudotim.pdf
    • https://cdn.shopify.com/s/files/1/0434/6678/4932/files/datosawu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/baby_boy_names_in_telugu_with_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0431/2281/9233/files/endocrine_causes_of_hypertension.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/analise_morfologica_exercicios_resolvidos.pdf
    • https://cdn.shopify.com/s/files/1/0440/5339/7654/files/rugem.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/73770960722.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/94661137451.pdf
    • https://cdn.shopify.com/s/files/1/0437/3243/5093/files/31659715234.pdf
    • https://cdn.shopify.com/s/files/1/0432/0493/5835/files/69260428692.pdf
    • https://cdn.shopify.com/s/files/1/0449/6100/5736/files/roman_catholic_telugu_bible_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/97851083894.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000885d.bin
2d19551652a1b24e5799ab54db273d276b6b6f69d0d68d176d512e747710b2e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x885D 5124 bytes
font_01_sfnt_off000099aa.bin
40014e97c8df5aebbc8322788415d2964b19219b60feef228d451ed6c51600e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99AA 10492 bytes

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