Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8c609bafcd4269…

MALICIOUS

PDF

32.6 KB Created: 2020-10-03 12:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 88db58238b0487f8fb2473006442cfb7 SHA-1: e81f69db975c237395bfa1facf6874b1574460d7 SHA-256: df8c609bafcd42692b3c438f8172df67cba8facb5a997afea04e0b0ff9f2fac7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain the same malicious URL and a benign-looking URL, likely to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the presence of a redirector suggests an attempt to lead the user to a malicious site, possibly for phishing or malware delivery.

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=a+level+maths+edexcel+textbook+pdf In 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/1/0464/6276/3160/files/53914396697.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6348/4315/files/minnie_mouse_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/4419312972.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2305/5523/files/gamamugopekuforonojitinax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4928/6813/files/994041704.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5663/4787/files/ken_penders_sonic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0458/9620/4442/files/real_wishes_granted_rules.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/windows_smart_test_failed_error_code_303.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5176/9247/files/buena_vista_library_hours.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7473/8586/files/sealing_to_parents_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2968/7203/files/784026522.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6289/3471/files/angel_has_fallen_movie_online_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8265/2579/files/group_of_8_halloween_costume_ideas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7142/9021/files/how_to_make_paper_minecraft_steve.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_off0000430b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x430B 5620 bytes
SHA-256: 1737c4a43ed06d6273a2a40dabcf3a31c31de7e4dfdcf09c1698082768b3952c
font_01_sfnt_off00005609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5609 9284 bytes
SHA-256: a9d94bd4906b49c8ae7393de487862cc2e1c27abad3194a5664b19ee4d435a0b

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