Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dcc776ba03ad2ad…

MALICIOUS

PDF

40.8 KB Created: 2020-08-18 18:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad13cede8ce0cf55ebc2a5fec1699546 SHA-1: f31c31952d056fe29da7c2d4eca26716266706ea SHA-256: 0dcc776ba03ad2adf58c33b7c88586e3fb691ed291bb1e076bafd241ca00a429
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector pointing to 'https://ttraff.ru/pify?keyword=bookworm+adventure+2+free++for+pc'. The document body, though heavily obfuscated, contains text related to 'bookworm adventure 2 free for pc', suggesting a lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

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.ru/pify?keyword=bookworm+adventure+2+free++for+pc
    • http://files.romehomelb.com/uploads/1/3/1/4/131438299/2962037.pdf
    • http://files.dtechinc.org/uploads/1/3/1/4/131438804/regek_bubenodud.pdf
    • http://gapitagu.centralchimneysweeping.co.uk/uploads/1/3/2/6/132681946/4756404.pdf
    • http://files.olivetteinbloom.org/uploads/1/3/0/8/130873708/8fef9a769c.pdf
    • http://nevatonot.waytoomuchstuffintheattic.com/uploads/1/3/0/7/130776661/liloza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4560/0931/files/webopisozogutane.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/tiwukikalafosamewut.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/70720602085.pdf
    • https://cdn.shopify.com/s/files/1/0441/2496/2968/files/big_endian_and_little_endian.pdf
    • https://cdn.shopify.com/s/files/1/0427/8625/9100/files/rerujoli.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/5850390702.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4456/files/71953294539.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/jabeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2758/files/22045326378.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/baazigar_movie_all_songs.pdf
    • https://cdn.shopify.com/s/files/1/0448/1482/7677/files/tavanumawumon.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8730/files/88990550639.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_off00005f13.bin
7e0b41a0880fe94393f34d09612ee076fed37ad226a8d4cee99f189fc01268ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F13 5488 bytes
font_01_sfnt_off000071c8.bin
6d7111d87e04fa752e07ac270b7b68d8a1b1c3e546c3eaa2ddb93a13682fe6f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C8 10468 bytes

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