Malicious PDF — malware analysis report

Static analysis result for SHA-256 6872599d5b34df76…

MALICIOUS

PDF

70.8 KB Created: 2020-08-30 18:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc7279485e7bd4d23a5da2af3d9f312e SHA-1: 9f755375e1011a295b12a9919acdc97482c4d79b SHA-256: 6872599d5b34df76379bab9bb6710a48912c941176463d0b3751d862f1b3f4d8
154 Risk Score

Malware Insights

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

The PDF file contains embedded links, with one prominent URL identified as a malicious redirector. The document body, though heavily obfuscated, appears to reference 'Batman the killing joke comic book', suggesting a lure to entice clicks. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's designed to redirect users to harmful content.

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/wix?keyword=batman+the+killing+joke+comic+book+p
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0452/5198/5565/files/ab-_ssby_card.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/bhagyanagar_arithmetic_reasoning_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6218/files/stanislavski_method_acting_exercises.pdf
    • https://static.usrfiles.com/ugd/804ff6_63de45b6961b4d9680a7010a18550ee6.pdf
    • https://static.usrfiles.com/ugd/3b47cb_eb117166af6547f9b81b7ab7357fbddb.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a4a28552da14ee794c5e4c0b8485d81.pdf
    • https://static.usrfiles.com/ugd/0f5b72_8358317c34d446d5a10c0055c1f561f2.pdf
    • https://static.usrfiles.com/ugd/9c0842_4c5a1a99746f46e992852185a830b012.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/daluzax.pdf
    • https://cdn.shopify.com/s/files/1/0455/4008/1829/files/mcdonald_s_business_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0437/4655/8113/files/satuan_acara_penyuluhan_bahaya_merokok.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/belajar_bahasa_arab_untuk_anak.pdf
    • https://cdn.shopify.com/s/files/1/0464/8042/5112/files/bobcat_753_service_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7388/8671/files/53368122066.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd52.bin
885976cbecd2390b3a6f899919bb5c38789c45172c7812b62446d458483726f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 5404 bytes
font_01_sfnt_off0000df87.bin
bd68e56b1ef2849e5d2b2080ee48c5c78fe7cde93159c694580ca65267b2b054
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 15036 bytes