Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8256317d76ecb71…

MALICIOUS

PDF

60.6 KB Created: 2020-08-15 04:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7e1a063c10c5370f30a3374e1d42507 SHA-1: cf416fcfe75c1207045f545940edb8f5a8293686 SHA-256: a8256317d76ecb71b6c75314e62a04c413783600ea54f620a9a161e72880a058
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=hybridization+examples+pdf'. The ML classifier also strongly indicated maliciousness. The document body itself is largely obfuscated but contains the malicious redirector URL and several benign-looking Shopify URLs.

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=hybridization+examples+pdf
    • http://files.savefarthingworthgreen.org/uploads/1/3/1/6/131637896/a4885f45cd.pdf
    • http://files.academicswithaplus.com/uploads/1/3/0/7/130738748/dokagit-tomolixegov-kofufafe.pdf
    • http://miriju.sharibatheactor.com/uploads/1/3/2/7/132740978/natoxozivibi.pdf
    • http://fogojug.tompigotpaintings.com/uploads/1/3/1/4/131406063/3679029.pdf
    • http://files.spartanleadershipgroup.com/uploads/1/3/1/3/131379899/47c1cb.pdf
    • https://cdn.shopify.com/s/files/1/0428/7568/2972/files/canoeing_the_mountains_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5974/files/77963834442.pdf
    • https://cdn.shopify.com/s/files/1/0452/7544/7458/files/bts_world_text_message_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2589/9426/files/i_got_2_phones_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5309/files/topemiwemiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/24412015071.pdf
    • https://cdn.shopify.com/s/files/1/0430/9296/7581/files/microsoft_excel_2020_formulas_list_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0434/0308/3928/files/mekudisularixilemewuruxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3834/files/70009089945.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/58733457133.pdf
    • https://cdn.shopify.com/s/files/1/0433/8994/3971/files/47884215671.pdf
    • https://cdn.shopify.com/s/files/1/0434/3732/6502/files/starters_cambridge_test_2020_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0439/1780/3675/files/zapilajipanolulujukipu.pdf
    • https://cdn.shopify.com/s/files/1/0450/7166/3256/files/tratamiento_de_hernia_de_disco_lumbar.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_off0000ae51.bin
f6324e299c7cc23556ea55579ca52f44b414f7eaecbaf204f15962cfc125ad74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE51 5508 bytes
font_01_sfnt_off0000c103.bin
b04516e6e31dbc4008638ec627d47c40b69bd3e76db5fac97ab27796f8463de3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC103 10492 bytes

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