Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3a2f152cb03fd8…

MALICIOUS

PDF

72.7 KB Created: 2020-08-09 12:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1de1ec3295495b131f3e039c9d633d99 SHA-1: bdef76ac580d9352e5b7db4ecb1b673908b75168 SHA-256: 8e3a2f152cb03fd8a5e3673bf11e52cce3f34479de32da1ebcdcfb0c144afd5b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=grief+and+loss+therapy+pdf'. This URL is presented within the document body, disguised as a resource for 'grief and loss therapy pdf'. The ML classifier also strongly flagged this PDF as malicious. The document appears to be a lure to redirect users to malicious infrastructure.

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.ru/pify?keyword=grief+and+loss+therapy+pdf
    • http://files.shodokan.org/uploads/1/3/0/9/130969545/3516035.pdf
    • http://files.bossbabemarketing.net/uploads/1/3/1/4/131437669/0e854f8de0a29.pdf
    • http://files.kingdomtransformationchurch.org/uploads/1/3/1/4/131452841/rekojamow.pdf
    • http://files.hillcountryyoungmarines.com/uploads/1/3/2/7/132741241/regafexekevu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9105/9097/files/sisoliwo.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/macbeth_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/3009/2696/files/dungeons_and_dragons_monster_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/6639/9647/files/overwatch_item_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0430/1009/7313/files/tejefavoboxofudazixiko.pdf
    • https://cdn.shopify.com/s/files/1/0435/4703/3752/files/konid.pdf
    • https://cdn.shopify.com/s/files/1/0436/8341/4169/files/59843888241.pdf
    • https://cdn.shopify.com/s/files/1/0439/3569/5016/files/92770330206.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/mowawogixituxar.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/how_to_uninstall_ios_10_beta.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/rutufigapazixirapo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0408/files/65454807997.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64630415929.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/6132335953.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_off0000d23e.bin
a8964d1526cd51cdd6c170df47200bacc629a05b98b3d72469879ef4fc539aaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD23E 5048 bytes
font_01_sfnt_off0000e36c.bin
33978b768e213dd4b6b382272c7de889baf648a7cc05196fcf817cab052ac99f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 10596 bytes
font_02_sfnt_off00010786.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 4324 bytes

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