Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0df49644aaa43e…

MALICIOUS

PDF

50.8 KB Created: 2020-08-12 18:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33b9b465e3a842ad2b53af1b9459de25 SHA-1: a2ec60c88fab45e35df949c9974ee39e34061f32 SHA-256: 5f0df49644aaa43ee60b662085a9f4f0afc2e13a073021a6f50dccf6d10b2f04
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm or redirector strategy. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text that appears to be a lure for 'activity based costing lecture notes pdf', directing users to the malicious URL.

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/pify?keyword=activity+based+costing+lecture+notes+pdf
    • http://files.getyourstarterkit.com/uploads/1/3/1/3/131398406/zonabotopid_medefu_xufotex_zitizij.pdf
    • http://debod.sustainability4all.org/uploads/1/3/2/7/132740405/2383505.pdf
    • http://files.unityosteo.com/uploads/1/3/0/7/130775156/eefc4e1b2d527d.pdf
    • http://birosu.pianobymelody.com/uploads/1/3/1/3/131384169/zibuvilanizafi-xatuxijir-gisukunuru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9579/3557/files/convert_scanned_to_word_adobe_pro.pdf
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/wolifomomudawaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/96106858877.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5278/files/panasonic_kx_tgea20_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/27590272610.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/lakefu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/milejadugibosewobelobali.pdf
    • https://cdn.shopify.com/s/files/1/0431/1751/0818/files/kisazufib.pdf
    • https://cdn.shopify.com/s/files/1/0431/4402/0125/files/66835235895.pdf
    • https://cdn.shopify.com/s/files/1/0430/3175/6957/files/69576494190.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7273/files/military_alphabet_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/8555/3061/files/mewejodigodozuva.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_off00008786.bin
28e3c9935d5b2250f939704dd5cc842b4299849c13877ca61c0c292d536f5311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8786 5616 bytes
font_01_sfnt_off00009ab0.bin
8e5d87c7c8c479e2005e2dbe38522cc7fe7e8b8c534d476bd22ab3abe1227f2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB0 10288 bytes

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