Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad40fea5695e2d33…

MALICIOUS

PDF

48.6 KB Created: 2020-08-22 05:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da2f6776d60cb4084bf7bf024e8bbddb SHA-1: c4234319eb8a583fbf33888dc32f5f0b8e0d21de SHA-256: ad40fea5695e2d33c65c18d094a58f360ade01e81b28b505e54445ede8ebc030
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'book cover maker free for pc' and the malicious URL, suggesting a lure. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves redirecting the user to malicious infrastructure under the guise of a useful tool.

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=book+cover+maker+free++for+pc
    • http://files.stjohnsmtpleasantmi.com/uploads/1/3/0/7/130739369/fa7a6308f.pdf
    • http://fefol.singsingprisonmuseum.org/uploads/1/3/1/4/131437296/jetife.pdf
    • http://baxolimis.opalandplum.com/uploads/1/3/1/4/131407558/nobenevazofi-ziladerelirumer.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/kimepodedilijefikojudo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31968244380.pdf
    • https://cdn.shopify.com/s/files/1/0434/8978/8069/files/difference_between_assembly_language_and_machine_language.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/flask_of_oil_wow.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.pdf
    • https://cdn.shopify.com/s/files/1/0429/7572/3673/files/after_effects_free_cs6.pdf
    • https://cdn.shopify.com/s/files/1/0432/4153/7696/files/cbse_class_8_maths_rational_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8930/files/administrao_pblica_patrimonialista_burocrtica_e_gerencial.pdf
    • https://cdn.shopify.com/s/files/1/0428/3134/7868/files/40866738216.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51191810805.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/37075665518.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061a5.bin
ca24bdafb8bbb869cbf463ec553f7ebe8fac9d92b2ff95474d77e3f511273adc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A5 6812 bytes
font_01_sfnt_off000072d9.bin
dda1852f481d5c913f2cd8802edf45aa012acb8950bd1e089f5826429668c36d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D9 5124 bytes
font_02_sfnt_off00008433.bin
f2cc2edb54fdd6bf965a42223c4a16a28e5f5e3db07a758fd338dca7256dec9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8433 2896 bytes
font_03_sfnt_off00009038.bin
e30a8e2ed5904ad5920652e8d013d74414e9276ba9e11c1b769c44748c032e35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9038 11224 bytes

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