Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a32bb344ea5141e…

MALICIOUS

PDF

81.7 KB Created: 2020-10-10 03:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1578a1404b0f9eab0ccda291c9311130 SHA-1: fdb3689ca7dce80a73ca1703189af16b30ad8eb1 SHA-256: 4a32bb344ea5141eef8399dca906fbc3d516a45d4f2cb035bd30b5dc0ec8a199
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://cctraff.ru/strik?keyword=suspend+sc+insecticide'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many of which are hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. These indicators suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

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=suspend+sc+insecticide In PDF document text
    • http://files.lifestylehealth12.com/uploads/1/3/1/3/131381036/3501494.pdfIn PDF document text
    • http://files.startcincinnati.com/uploads/1/3/1/4/131409017/716156.pdfIn PDF document text
    • http://files.wovenbygraceboutique.com/uploads/1/3/1/6/131606492/wikekasu.pdfIn PDF document text
    • http://files.matiastautimez.com/uploads/1/3/1/3/131378776/baxivuza.pdfIn PDF document text
    • http://files.alanbirtwistle.com/uploads/1/3/1/3/131383664/werox_xapedewero_bemidituziv_zurer.pdfIn PDF document text
    • https://site-1036679.mozfiles.com/files/1036679/86555044551.pdfIn PDF document text
    • https://site-1039127.mozfiles.com/files/1039127/35232496455.pdfIn PDF document text
    • https://site-1037275.mozfiles.com/files/1037275/witekanogobirosododixin.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/1/0480/0905/2319/files/jumunimokuzodinewilezu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7530/9220/files/90452296619.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/dictionary_words_that_start_with_letter_y.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/4667/2805/files/biographical_statement_for_graduate_school_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0366/5822/files/literary_analysis_prompts.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_off0000ff1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1D 4832 bytes
SHA-256: fba577ec3d6e58e53fed8a7745162ed8a01d6a3e6c7c76d6b1bb25a3b4e4bc7b
font_01_sfnt_off00010fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 13156 bytes
SHA-256: 87ab49642158c1600de149278e0fa96a9f99cac6302621961bea420c3c1b69a3

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