Malicious PDF — malware analysis report

Static analysis result for SHA-256 8276fd2db8e2b577…

MALICIOUS

PDF

41.8 KB Created: 2020-09-01 14:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42aebdd5e7e16ce85d9cf9ec2bcb21bc SHA-1: 6467373bf2ecf5a96a469347a472a59d3aadfe6c SHA-256: 8276fd2db8e2b5774c9a88f4df292100256094be6b08c9d6446de63e2168396e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of these links, 'https://ttraff.club/wix?keyword=m+c+ki+full+form', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to the malicious URL and benign-looking PDF links, suggesting a lure to a malicious site. The ML classifier 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.club/wix?keyword=m+c+ki+full+form
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0432/9517/8902/files/99443933921.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7098/files/disajisipusu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7873/0403/files/que_es_el_modelo_neoliberal.pdf
    • https://cdn.shopify.com/s/files/1/0434/4542/0188/files/91628711366.pdf
    • https://cdn.shopify.com/s/files/1/0433/9138/5758/files/12895405761.pdf
    • https://cdn.shopify.com/s/files/1/0430/3031/5159/files/16433088243.pdf
    • https://cdn.shopify.com/s/files/1/0462/5763/5479/files/division_worksheets_grade_5_common_core.pdf
    • https://cdn.shopify.com/s/files/1/0435/0522/1784/files/82377317590.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/zepoposu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/xopomegodejiwibigujew.pdf
    • https://cdn.shopify.com/s/files/1/0434/7101/2006/files/mogotajagevamow.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4933/files/english_exercises_past_simple_irregular_verbs.pdf
    • https://cdn.shopify.com/s/files/1/0432/7289/6678/files/asturias_music_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2951/files/que_es_significa_uniforme.pdf
    • https://cdn.shopify.com/s/files/1/0434/0056/0803/files/gutij.pdf
    • https://cdn.shopify.com/s/files/1/0437/6258/1658/files/bridges_in_mathematics_kindergarten.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_off000057ae.bin
f0ae1731f38a1b2eea24140a4ef66f427d6ad6785f3a72210556ae0580d88776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57AE 4708 bytes
font_01_sfnt_off000067b0.bin
ee83bd8eb5c64278304d47b056b60bf5d9c7044898d5cb89149cbc685211f69d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B0 9532 bytes
font_02_sfnt_off00008890.bin
bd41c349816ce34ee697827dd3b4a817379e2334f3489817f9ea43f2a45e707a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8890 4812 bytes

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