Malicious PDF — malware analysis report

Static analysis result for SHA-256 597ad36ef84efa07…

MALICIOUS

PDF

54.2 KB Created: 2020-08-20 05:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf5054d63ef4705cd90eba50ad191412 SHA-1: 867549349033b22fd310b0351fd2b03c691a09fc SHA-256: 597ad36ef84efa07e96f9ad2578ecab3a1594b495e32918b8650f9d602569d1e
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to lure users with the promise of free invitation templates. The ML classifier strongly indicates maliciousness, and the presence of a known malicious redirector URL confirms the intent to lead users to a harmful site. The document body, though heavily obfuscated, contains the URL that is also flagged by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic.

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=costume+party+invitation+templates+free
    • http://bovozeseg.patriotfarmbostonterriers.com/uploads/1/3/1/8/131872225/xokuxijum.pdf
    • http://febuso.k9justincase.com/uploads/1/3/2/7/132712354/a2f70.pdf
    • https://cdn.shopify.com/s/files/1/0436/8780/5081/files/inquiry_into_physics_7th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7022/5574/files/85645955187.pdf
    • https://cdn.shopify.com/s/files/1/0434/6177/1430/files/imagenes_para_colorear_mandalas.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8330/files/talejolataru.pdf
    • https://cdn.shopify.com/s/files/1/0430/4463/4773/files/48964478812.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/tisamubasajamow.pdf
    • https://cdn.shopify.com/s/files/1/0431/2629/2629/files/javuxil.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9927/files/35675098140.pdf
    • https://cdn.shopify.com/s/files/1/0430/4073/5381/files/my_arabic_alphabet_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/2587/4600/files/dc_machines_b_l_theraja.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/arrl_extra_class_license_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/90910151872.pdf
    • https://cdn.shopify.com/s/files/1/0447/4676/8533/files/alarm_controls_600d.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_off00008a93.bin
0ecf50aa1ead6492096f16479f0807661fcc06b4e2ee9a72762969dc5aa6d238
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A93 5116 bytes
font_01_sfnt_off00009bea.bin
01977fb0bd031e7915d64625f3924b45cd1886ac5c9fb380ab5bf14429bfc2ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BEA 15460 bytes