Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d6949e9c28913c…

MALICIOUS

PDF

40.5 KB Created: 2020-08-17 03:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: def09ae4f6a1d934bb74736eb855fd35 SHA-1: 7bf75b6c16f2d373c81d47fb48c59e98afc150bc SHA-256: 36d6949e9c28913c578fd4c6033f09d9d589bfe2e8d90e095de52670a5038825
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to potentially malicious redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=lava+song+uke+chords+pdf, which is a known malicious redirector. This suggests the document is designed to trick users into clicking malicious links under the guise of providing search results.

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=lava+song+uke+chords+pdf
    • http://sazaz.the450alchemist.com/uploads/1/3/0/7/130776447/vamejebamorebawe.pdf
    • http://files.aarondarling.com/uploads/1/3/1/4/131483053/3774913.pdf
    • http://files.chica-fashion.com/uploads/1/3/1/8/131857315/925f00fb.pdf
    • http://files.mss4ball.net/uploads/1/3/2/3/132302710/nanekene_zugofar_dilomuzeziwud.pdf
    • http://ginape.threelittlepigsbath.com/uploads/1/3/0/8/130874218/belatogojig-jobolijumulere-juxarok.pdf
    • https://cdn.shopify.com/s/files/1/0435/2117/9802/files/economic_structural_adjustment_programme_in_zimbabwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4295/files/84401434041.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0285/files/best_interactive_reader_for_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0433/1244/7652/files/86516359607.pdf
    • https://cdn.shopify.com/s/files/1/0430/0672/2211/files/51472690971.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2072/files/spoken_english_lessons_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0428/8725/0087/files/june_2016_physics_regents.pdf
    • https://cdn.shopify.com/s/files/1/0434/2936/3878/files/70433391802.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/alcohol_120_mac_os_x.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2102/files/pifikedediwavader.pdf
    • https://cdn.shopify.com/s/files/1/0435/7524/7003/files/service_report_format_for_air_conditioner.pdf
    • https://cdn.shopify.com/s/files/1/0439/9572/5982/files/fenumigogiwetiridu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000611e.bin
110f95c898626a3f3e958f581c98d74584785360311e8ac7c62f950856ab9346		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611E 5448 bytes
font_01_sfnt_off000073ad.bin
2970ff164910d92df067ec84576e83ce11cfe249dd63171b561cffd55d3483b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73AD 9812 bytes

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