Malicious PDF — malware analysis report

Static analysis result for SHA-256 4126d1a430d9aa3a…

MALICIOUS

PDF

48.3 KB Created: 2020-08-11 21:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24e9135a83d3545100c3a39488933ff0 SHA-1: fb2fd75d6af1f59504b545ee1d53f5d026441e59 SHA-256: 4126d1a430d9aa3a167481954b38c388df014968fe564ef4eeb384cc28985ea8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, contains text related to 'kidney stone' and the malicious URL, suggesting a lure for a scam or phishing attempt. The ML classifier also strongly indicated maliciousness.

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=kidney+stone+%25E0%25B8%2584%25E0%25B8%25B7%25E0%25B8%25AD+pdf
    • http://gedim.hapia2013.org/uploads/1/3/1/6/131606490/xitim.pdf
    • http://files.nxtgenerationenergy.com/uploads/1/3/2/7/132740415/sodegebu.pdf
    • http://kifipaju.mysticaltuscanyretreat.com/uploads/1/3/2/7/132741555/c9c8da2c5bd.pdf
    • http://files.neverquitneverdie.org/uploads/1/3/1/4/131406258/xeduxi_pusuwigude_fomixugane.pdf
    • https://cdn.shopify.com/s/files/1/0441/0349/9928/files/64724386043.pdf
    • https://cdn.shopify.com/s/files/1/0432/4573/2007/files/tutusulujajabuxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0787/7017/files/strona_bierna_angielski_wiczenia_past_simple_present_simple.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/grant_cardone_sell_to_survive.pdf
    • https://cdn.shopify.com/s/files/1/0453/9131/5112/files/buck_converter_operation.pdf
    • https://cdn.shopify.com/s/files/1/0438/8388/8808/files/siselusatuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4717/files/primary_care_a_collaborative_practice_5th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/3765227115.pdf
    • https://cdn.shopify.com/s/files/1/0435/9634/9602/files/97709389246.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/24335970548.pdf
    • https://cdn.shopify.com/s/files/1/0438/5754/3328/files/84263410092.pdf
    • https://cdn.shopify.com/s/files/1/0432/4317/6091/files/essentials_of_corporate_finance_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/3164/8661/files/fawaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2805/files/81719421312.pdf
    • https://cdn.shopify.com/s/files/1/0437/7808/0925/files/werajar.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ae3.bin
99285c1ce4f8bbf3dc5a448c2860a8fa66674124140dfe9f46762da7891e60a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE3 4768 bytes
font_01_sfnt_off00006b3c.bin
52355759f6ba1634ebf803835453c5f0cbcfa1783c35bff7bbad6af133335d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3C 6180 bytes
font_02_sfnt_off00007b38.bin
402d983e078277fb80b451e16c6cf522a9f41873e6144ebb283d942517bc9499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B38 6848 bytes
font_03_sfnt_off00008d5e.bin
de029bad794181d07ce67d1c1c297152510fb009375cf17aff9b49e29a7b7d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5E 11100 bytes

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