Malicious PDF — malware analysis report

Static analysis result for SHA-256 e658ad52356094a8…

MALICIOUS

PDF

60.5 KB Created: 2020-08-01 04:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c18472c5dd7a613f8a845e88d8df968 SHA-1: 35fc5603bbc19bd1afc8d922e5e5c565dbadaa36 SHA-256: e658ad52356094a854e48c617a79db8a561f551e65b85f0c4fc726b3f24aec05
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains multiple embedded links, with one identified as a known malicious redirector (ttraff.cc). The document body, though heavily obfuscated, contains the target URL. The presence of a link farm heuristic further suggests an attempt to manipulate search engine results or distribute content through numerous links. The ML classifier strongly indicates malicious intent.

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=list+of+us+cities+by+population
    • http://files.drmorgannd.com/uploads/1/3/0/8/130814286/158e9c.pdf
    • http://files.hkcompetitionassociation.org/uploads/1/3/1/3/131379594/kazewasajinujijit.pdf
    • http://files.trugrmn.ca/uploads/1/3/1/0/131070089/figokifu_pazupodowevaraf_tirubupozo_nuxiwojipazas.pdf
    • http://files.thetlacademy.shop/uploads/1/3/1/3/131384789/dupive-madelubupazape-dezarekinoza.pdf
    • https://cdn.shopify.com/s/files/1/0437/7611/4837/files/36594891947.pdf
    • https://cdn.shopify.com/s/files/1/0440/6145/8582/files/9758217953.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/korofupisezevanujolibeke.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8392/files/cdr_to_pdf_online_converter_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8387/files/81578149451.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/97295907281.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fuxojusi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/gibetufakimomojot.pdf
    • https://cdn.shopify.com/s/files/1/0431/6702/3259/files/rumudasagovabanemafi.pdf
    • https://cdn.shopify.com/s/files/1/0439/1721/3851/files/15452110019.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60359225188.pdf
    • https://cdn.shopify.com/s/files/1/0433/8280/0542/files/duladolibupojofonififa.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_off000098f6.bin
4a27c50445acb0cd571863b88b12711e23affc4f42f204444a43e8cd95e6a041		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98F6 4976 bytes
font_01_sfnt_off0000a9f3.bin
aa10019d781768b72cdd0842b68d4d62a8e0753c5661652ca8f6153fefe82a9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9F3 14332 bytes
font_02_sfnt_off0000d6bd.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 4324 bytes

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