Malicious PDF — malware analysis report

Static analysis result for SHA-256 1768047ab5d50f47…

MALICIOUS

PDF

48.5 KB Created: 2020-08-10 07:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44d9ecdabe64b2722ca8416e490f1c98 SHA-1: 2d78b08815e4c664aaf9586837995d08319cd706 SHA-256: 1768047ab5d50f475a48e4ff950e4772eb3308ecdf578e4db2e63d8f25addeac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one critical heuristic identifying it as a malicious redirector. The document body, though partially corrupted, contains text related to 'uml diagrams for banking system pdf' and the malicious URL, suggesting a lure. The presence of a large number of external PDF links, many pointing to benign Shopify URLs, indicates a potential SEO manipulation or link farm tactic. The ML classifier also strongly flagged this PDF as malicious.

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=uml+diagrams+for+banking+system+pdf
    • http://files.myworldsparkles.com/uploads/1/3/1/4/131437878/vudobujoxuvetozusu.pdf
    • http://files.anelelundborg.com/uploads/1/3/1/4/131453022/ponowuxepevafod.pdf
    • http://files.lesleehampelphoto.com/uploads/1/3/1/4/131406744/gixukemesolage_bizoxaxijanaxud_xabobe.pdf
    • http://files.capetowndaytours.net/uploads/1/3/0/8/130874629/bugob-bowon-jozopo-vudux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/66521182960.pdf
    • https://cdn.shopify.com/s/files/1/0431/4474/1024/files/meaning_of_business_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/yahoo_mail_read_receipt.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/54832817057.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/467339804.pdf
    • https://cdn.shopify.com/s/files/1/0438/2212/1122/files/38330765154.pdf
    • https://cdn.shopify.com/s/files/1/0434/1396/2919/files/anemia_hemolitica_autoinmune_neonatal.pdf
    • https://cdn.shopify.com/s/files/1/0436/1181/6099/files/31998435985.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1651/files/red_black_tree_properties.pdf
    • https://cdn.shopify.com/s/files/1/0435/4254/4533/files/37606728495.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/64378130024.pdf
    • https://cdn.shopify.com/s/files/1/0441/3577/6408/files/afcat_exam_preparation_books.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_off0000778b.bin
30a4b16e84320b8b649cd5cdbfe350710612d8d03095b35e9c594cb584543d42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778B 5660 bytes
font_01_sfnt_off00008ac1.bin
c39c98ee1bba7bff7c74c952c074391814c767887951f7992cf639dcd2285842		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC1 13600 bytes

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