Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4f7ac590b6fa91…

MALICIOUS

PDF

56.1 KB Created: 2020-08-13 14:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4628ae5abcf1f5776eee2de2c37e4e51 SHA-1: fd92e3114b840252703f1e8ae076f60502af124a SHA-256: 5e4f7ac590b6fa91695b72a3aebe7f5d45b49fa0ff9751a8ada1d1d52e8aeaad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious due to its structure, which contains a large number of embedded links. The primary link, 'https://ttraff.com/wb?keyword=ejercicios%20de%20divisibilidad%20y%20numeros%20enteros%202%20eso%20pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain similar URLs, suggesting a link farm or SEO poisoning tactic to direct users 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.com/wb?keyword=ejercicios%20de%20divisibilidad%20y%20numeros%20enteros%202%20eso%20pdf
    • http://files.littlechalkhouse.com/uploads/1/3/2/7/132712015/sagukapaneveru_pizepe_namewoj.pdf
    • http://files.kapsi-cac.com/uploads/1/3/0/9/130969920/0a4a7.pdf
    • http://xiwebu.roanokevabahaicluster.org/uploads/1/3/0/7/130775052/vozum_liloranitezaw_rulapep.pdf
    • http://xurarubes.100daysofworkouts.com/uploads/1/3/1/3/131383790/pebowejuruwunetu.pdf
    • http://files.mrgrenier.com/uploads/1/3/1/0/131070689/nonazisipaze-gatot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94192334972.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/free_printable_bubble_letters.pdf
    • https://cdn.shopify.com/s/files/1/0440/7345/1670/files/ligoju.pdf
    • https://cdn.shopify.com/s/files/1/0428/7397/9043/files/4706662185.pdf
    • https://cdn.shopify.com/s/files/1/0431/1003/9719/files/91654454609.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/8000/files/apollinaire_alcools.pdf
    • https://cdn.shopify.com/s/files/1/0431/0401/0389/files/bhagavad_gita_tamil_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8093/1733/files/29826797886.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/reden.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/27534439121.pdf
    • https://cdn.shopify.com/s/files/1/0434/7923/6773/files/27771919315.pdf
    • https://cdn.shopify.com/s/files/1/0434/2651/3048/files/33434402633.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_off00008a7d.bin
225d29e04d21b0a8d75491b061397ace85b9c89b6dc94ebabbd044a7601388aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7D 5648 bytes
font_01_sfnt_off00009da5.bin
4aa694ca4334778332f34b09e67d6d5da86942d77758b1b13af05ffd2a238e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA5 11428 bytes
font_02_sfnt_off0000c2ec.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EC 4324 bytes

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