Malicious PDF — malware analysis report

Static analysis result for SHA-256 025ebdcc4b8b1768…

MALICIOUS

PDF

50.1 KB Created: 2020-08-24 01:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a00cdc57f07a4e08f6edfd83749f132 SHA-1: 513a5080bf19b4ee1c7ed657e1c8ce023c0bcf2e SHA-256: 025ebdcc4b8b17682bcf3c1850f1efdcd0b5cb8d24c6d5df5657c0a3233c5784
162 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'exit interview questions' and includes the malicious URL, suggesting a phishing or social engineering attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=exit+interview+questions+samples+and+answers
    • http://kuwedib.emilyjernigan.com/uploads/1/3/0/7/130776088/zutoremuv-pipaz-viwupebezofamax-savewa.pdf
    • http://files.eztaughtme.com/uploads/1/3/0/7/130775076/wijufedifizewuted.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/3728/6812/files/datin.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8486/files/apostol_calculus_volume_2.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4695/files/rudamagegenokupaperinir.pdf
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/blitzer_college_algebra.pdf
    • https://cdn.shopify.com/s/files/1/0433/6638/3770/files/16214605900.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/vogitalozebopiruxapav.pdf
    • https://cdn.shopify.com/s/files/1/0438/3830/8512/files/fubak.pdf
    • https://cdn.shopify.com/s/files/1/0448/6434/0130/files/plutarch_on_sparta.pdf
    • https://cdn.shopify.com/s/files/1/0429/3174/9031/files/mageze.pdf
    • https://cdn.shopify.com/s/files/1/0438/1078/3394/files/tipitisugoke.pdf
    • https://cdn.shopify.com/s/files/1/0444/0725/9302/files/simple_equations_worksheet_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/2973/2248/files/sefuzigaloxofugene.pdf
    • https://cdn.shopify.com/s/files/1/0459/1874/8823/files/xfinity_application_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007810.bin
f60d3d5b370c42736aac6b0b60310098b55f7ae4e0c623c530b8b481eb483b2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7810 5292 bytes
font_01_sfnt_off000089ff.bin
480afb9c207395d45bfa9a8f4c4ee9816da8ac861eaa1492687304cf5e8561be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FF 10160 bytes
font_02_sfnt_off0000acae.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACAE 4324 bytes

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