Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbeefa7c25f9c1c…

MALICIOUS

PDF

100.3 KB Created: 2020-10-06 23:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9dc38efc4f70f7231e0b87e2920af11d SHA-1: 8bbf6183760ba041a1073aa8a01bf4c24d161e65 SHA-256: 9dbeefa7c25f9c1ca7b6c6428980981ce9b4da373cdf1f5d9e6e3b165bb10920
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://cctraff.ru/strik?keyword=activated+carbon+book+pdf'. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to trick users into visiting a malicious site. The presence of numerous external PDF links also indicates a potential link farm or SEO manipulation tactic.

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=activated+carbon+book+pdf In PDF document text
    • http://files.lafayetteorchestra.org/uploads/1/3/1/4/131406269/penalafagufik-silosataz-fuxajobejuvumax-bipij.pdfIn PDF document text
    • http://mukagapo.susannahsheffer.com/uploads/1/3/0/8/130814020/mijitojuni-mejatumijub.pdfIn PDF document text
    • http://files.antoniatsaknaki.com/uploads/1/3/1/4/131482886/mazinu.pdfIn PDF document text
    • http://files.kamkomics.com/uploads/1/3/0/7/130738988/winuga.pdfIn PDF document text
    • http://wefis.adelaidechickensittingservice.com/uploads/1/3/1/3/131383982/fogarikozez.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/1/0483/4777/5136/files/philadelphia_inquirer_death_notices_obituaries.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8334/9657/files/sajukevuto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2368/6056/files/los_tres_hermanos_van_nuys.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2227/3693/files/tertiary_circular_reactions_demonstrate_the_child_acting.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1987/9079/files/tempurpedic_seat_cushions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/earth_science_chapter_7_review_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8109/6096/files/vanobewevufasopejimexak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2749/2764/files/discover_your_heart_flag_page_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4712/7720/files/pasco_county_probate_court_records.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5366/5442/files/77414751461.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC9 5192 bytes
SHA-256: 21c2ebb6923394a5b7084ca5306cfc6993acda44bce80a5177850fc675909f76
font_01_sfnt_off00013f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8C 14576 bytes
SHA-256: 1a92091a0dc1b9cabbdb7737895e920afa4064f978602a025a41e7ddeaf419c2
font_02_sfnt_off00016d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D89 16292 bytes
SHA-256: d92e8a9350fb3a400c71170d5f0b11edd77395ca116aebbe17dad3012e9fec59

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