Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3efcaf32c6d0081…

MALICIOUS

PDF

47.1 KB Created: 2020-08-22 12:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fe1dd512fb49481ed6c46a298175e98 SHA-1: 60cad77792526db409c71c4351e40288074c17c2 SHA-256: d3efcaf32c6d0081c4de8a0036964836e6f51220ba339dd03772cd9393756402
152 Risk Score

Malware Insights

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

The PDF contains numerous links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'haunted house hidden object game' and includes the malicious URL. This suggests a social engineering lure to trick users into clicking the link, which then redirects to potentially harmful content. 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.com/pify?keyword=haunted+house+hidden+object+game
    • http://jopodew.dulcineaquartet.com/uploads/1/3/1/4/131408071/31561b339bcad.pdf
    • http://gepeked.misoagogo.com/uploads/1/3/0/9/130969423/bf199c35.pdf
    • http://files.fluidfitperformancetraining.com/uploads/1/3/1/4/131453193/1c3381434f.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3420/files/fast_email_verifier.pdf
    • https://cdn.shopify.com/s/files/1/0433/7693/5070/files/85456808937.pdf
    • https://cdn.shopify.com/s/files/1/0432/2672/6568/files/79537506428.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9461/files/51959327871.pdf
    • https://cdn.shopify.com/s/files/1/0460/2216/4639/files/silabus_biologi_sma_kurikulum_2013.pdf
    • https://cdn.shopify.com/s/files/1/0433/1080/9256/files/los_escritores_de_la_libertad.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6556/files/96288282501.pdf
    • https://cdn.shopify.com/s/files/1/0432/2807/0052/files/jorifeninosokamopam.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/temekakupefamubutifuxugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/gigaxot.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/8996017092.pdf
    • https://cdn.shopify.com/s/files/1/0438/2618/4352/files/1670626825.pdf
    • https://cdn.shopify.com/s/files/1/0456/8252/4319/files/abstract_and_concrete_nouns_worksheet_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0432/9878/3382/files/pofutirujego.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006260.bin
32f94e0f4bd2ff1325cebf9faa0e714ee9a49b3d9e693c722a3428b9986e9253		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6260 5400 bytes
font_01_sfnt_off00007497.bin
dced42748b774a4a2c7b83bb7468e0948a73d226430ce97d19fc106639a587df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7497 10616 bytes
font_02_sfnt_off00009915.bin
0edaf20887b6fa97af11b68fb5a14423f5f53e9da2dc24dfa575a6c2b0090066		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9915 16628 bytes

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