Malicious PDF — malware analysis report

Static analysis result for SHA-256 1145a29781f9ad88…

MALICIOUS

PDF

43.4 KB Created: 2020-08-19 11:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe6f7e9082a6abb56dfcb78e72086160 SHA-1: 44881710084e5092c6557f0c2fcc6fde59b58f32 SHA-256: 1145a29781f9ad88009bceacff6567b3ee87f178677211af2ef56a55801143c5
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains references to 'Bates motel' and includes numerous URLs, many pointing to Shopify domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a malicious URL.

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.com/pify?keyword=bates+motel+5+temporada++mega
    • http://files.berkeleyltc.com/uploads/1/3/1/3/131380094/gabusisa.pdf
    • http://talibi.southwestpaddlecompany.com/uploads/1/3/1/4/131437812/babid_lemumini_jodikiku_losubudur.pdf
    • http://files.laurajanestanfield.com/uploads/1/3/1/3/131381450/gerilix_vesewoxotala.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2579/1138/files/linkedin_share_link.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/pukesomasobenepizekozanid.pdf
    • https://cdn.shopify.com/s/files/1/0450/9630/4803/files/good_answer_to_how_are_you_doing.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/febazebasoxigiraxoli.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/soxorafemawuvelutuwufekol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ropuxikasafomudixaxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6175/5555/files/74153028327.pdf
    • https://cdn.shopify.com/s/files/1/0432/0870/4164/files/organic_chemistry_for_bsc_1st_year_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8879/8111/files/algebra_1_regents_2019.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005067.bin
9486d1187f478e789624bf8e4964d3e0894f01f0557a3170d5e7dde039eb8ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5067 5452 bytes
font_01_sfnt_off000062d6.bin
28ae129956520c56779cd357c7955f8c61792d409a1d1d377eb65c3c1b28f949		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D6 13076 bytes
font_02_sfnt_off00008b2f.bin
f5dc0604138e793d9c73a6fcfd7242a7d0fce5cadd585302060b06131659a494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2F 16288 bytes

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