Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91f5968c6ade5da…

MALICIOUS

PDF

71.6 KB Created: 2020-08-17 04:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e00b30b90b08a058c5d57845141f05fc SHA-1: 2b2d65fbdfe6dc5d634e89e2c5a930f069c1173a SHA-256: b91f5968c6ade5da56699d978a46aa7f861d9194cad458683496e36de8caddae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=seven+stages+of+grief+worksheet'. Additionally, it features a PDF link farm heuristic, indicating a large number of outbound links, with the first being 'https://cdn.shopify.com/s/files/1/0434/6196/8025/files/wubobexowofitixuwoxef.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to a phishing or malware distribution site.

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=seven+stages+of+grief+worksheet
    • http://nogoxipi.msqg.org/uploads/1/3/2/6/132683289/1792085.pdf
    • http://files.denysebridger.com/uploads/1/3/1/1/131164097/jobumaxodute-zujanu-mosupuzulazivi.pdf
    • http://files.danbonnell.com/uploads/1/3/0/7/130775952/7270038.pdf
    • http://kaligos.andrewwittkamper.com/uploads/1/3/1/8/131871825/fetitapinu_dosedu_puraru_somoponefetata.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/wubobexowofitixuwoxef.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1070/files/apex_legends_ps4_pc_cross_platform.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/75887564082.pdf
    • https://cdn.shopify.com/s/files/1/0432/0880/2466/files/44692486693.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7552/files/90446980091.pdf
    • https://cdn.shopify.com/s/files/1/0434/7746/7288/files/kigizoluviguxonilenux.pdf
    • https://cdn.shopify.com/s/files/1/0430/9044/4445/files/per_unit_calculation_power_system.pdf
    • https://cdn.shopify.com/s/files/1/0429/7274/1791/files/falexivopusidaxikiwuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/11914059300.pdf
    • https://cdn.shopify.com/s/files/1/0439/4339/5483/files/rearrange_pages_offline.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0339/files/marxisme_untuk_pemula.pdf
    • https://cdn.shopify.com/s/files/1/0431/3477/9553/files/wenalewin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/assessment_tools_for_preschool.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc09.bin
e18a867a5c943770d23956cc287edf03fb7c63aab2dcef9a40176cfb6c546708		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 5316 bytes
font_01_sfnt_off0000ee32.bin
9f21ab7b719c8232245e0e63d28d63f46294531e126d2da875f29cc9e4f1e6d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 10192 bytes

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