Malicious PDF — malware analysis report

Static analysis result for SHA-256 817b6bef16b83245…

MALICIOUS

PDF

45.2 KB Created: 2020-08-07 21:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f21fe5808777c3610dc60fdbd2b7f08a SHA-1: e04bb4858cd73b322d0304222669d1cde4628025 SHA-256: 817b6bef16b83245e566a7996f50761a3ea4c903f54582a8c483bbc77fed2056
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body contains garbled text but includes the malicious URL and several Shopify URLs, suggesting a link farm or SEO manipulation tactic to drive traffic to malicious sites.

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.cc/pify?keyword=utensilios+de+cozinha+em+ingles+pdf
    • http://files.delectanibble.com/uploads/1/3/1/4/131438217/boxokajikawevunadato.pdf
    • http://files.handsfreehectare.com/uploads/1/3/2/7/132740408/39ffc6.pdf
    • http://files.nalinikrishnankutty.com/uploads/1/3/0/8/130874128/mewajuluxojuvafox.pdf
    • http://files.mothernurtured.com/uploads/1/3/0/8/130814515/1566625.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/3178/7670/files/55821192376.pdf
    • https://cdn.shopify.com/s/files/1/0432/5533/3027/files/present_simple_exercises_perfect_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48787523288.pdf
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/11633762397.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/partnership_fundamentals.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/62439954971.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/1341631147.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/vameb.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/vekis.pdf
    • https://cdn.shopify.com/s/files/1/0429/7264/3491/files/babizanogozexoxopejugof.pdf
    • https://cdn.shopify.com/s/files/1/0435/8828/8675/files/associer_deux_en_un_seul.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000612b.bin
86253b196143abbde1d1ade6524a4d915240787b70d40f6129c0dbe7696ef11d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612B 5300 bytes
font_01_sfnt_off00007316.bin
60ce2e94d5ea12cb6591d6609b5ce29c5ef59eebd872f8821aa2cb32aa333a30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7316 12132 bytes
font_02_sfnt_off00009822.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9822 4324 bytes

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