Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa802035c375947…

MALICIOUS

PDF

50.1 KB Created: 2020-10-07 05:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a3b14698070f544bfd1244ac96ca9821 SHA-1: bf07100541303a8bac3f8578be1346e60c22bad3 SHA-256: aaa802035c375947fd9cd83eadf9cdb94c2dff1da1fba78582fa14a359cea970
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, many pointing to Shopify domains, suggesting an attempt at SEO poisoning to distribute malicious content. One critical heuristic identified a link to a known malicious redirector infrastructure at https://cctraff.ru/strik. The document body, though heavily obfuscated, contains the same redirector URL and a reference to 'touch math double digit subtraction worksheets', likely a lure. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/strik?keyword=touch+math+double+digit+subtraction+worksheets In PDF document text
    • http://files.erecknergreenhouses.com/uploads/1/3/1/3/131380745/gowatolavuposun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5763/5743/files/rinitu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0185/6679/files/navoviwokenagevepo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1504/3734/files/bias_by_source_control.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1567/0429/files/polom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/5966/7095/files/suede_couch_cleaner_home_depot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8085/1364/files/3_p_orbital_shape.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5839/9905/files/vmware_workstation_9_keygen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/0070/7488/files/65951564902.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9136/9377/files/tavenilometelupivajub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7210/2308/files/22832689927.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1101/2770/files/dobatinimutotukuzed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/executive_command_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6909/3541/files/zte_grand_max_plus_cases_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9540/7269/files/tixafi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E3 5600 bytes
SHA-256: 52d1c6b90d2d626982dba65019786cdfc95b0e46d68bea8d7572a5df5acb9150
font_01_sfnt_off000097ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97CA 10352 bytes
SHA-256: 4bf83af35776c2ee43ee147ee3e871005f3e56c1913400b3fb7d838e49acffe1

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