Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eaf7ce9bfad2196…

MALICIOUS

PDF

81.1 KB Created: 2020-08-23 03:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d62b511d846d51ffb53d14b3a0f26907 SHA-1: cff4a454c239b50ac0011a27db73ef12928578a0 SHA-256: 0eaf7ce9bfad21960d314e5df4a2f8ae54c70006b98c90aa93a28e95f96593d4
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a search result for a specific PDF, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links indicates a potential link farm or SEO spamming operation.

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=algernon+blackwood+john+silence+pdf
    • http://files.padreserra.org/uploads/1/3/1/6/131606454/wurumupaxelaborafuw.pdf
    • http://files.fbclocustgrovepreschool.com/uploads/1/3/1/6/131637484/kilavojenejisowefo.pdf
    • http://files.jennyjohnstonteacher.com/uploads/1/3/0/8/130874110/jepuludena_futowiniteje_benilajipubuvul.pdf
    • http://files.valerindawilds.com/uploads/1/3/0/7/130740292/leronojapim_xunufewofinipiw_sujukasavutu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6263/1326/files/baarish_yaariyan_song_video_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/1144/8729/files/23307030275.pdf
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/fadibamusiwirovopotuga.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/free_text_to_voice_generator.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/fomobaruwapaxelafifo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1974/files/kodukapuzawet.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/fusabesoxufenowu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8339/9321/files/33373625172.pdf
    • https://cdn.shopify.com/s/files/1/0440/0293/4942/files/29752089951.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedagefegumam.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/how_to_do_square_root_in_python.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_off00010048.bin
a1de1e4c2e04f459d268c5c308c5c0f07a7b985eee86ac5455286caaf2b9b4ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 5780 bytes
font_01_sfnt_off000113f4.bin
e73c13a664425e84a85b21899fa70f1609fb37bf411f338873694165166743d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 10324 bytes

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