Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdb4a6d8fe538c3…

MALICIOUS

PDF

51.8 KB Created: 2020-08-18 17:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e53200958a4870381e61de8c150849d1 SHA-1: d4308b00153d2b8a0c5b494fa71d3f9583d2ea6b SHA-256: efdb4a6d8fe538c3d2acd32e6b4f0abbdcf91823470620f3abe5304b09e2ea0e
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the primary malicious URL. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users through a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=amelia+bedelia+means+business+book+report
    • http://sodaro.printedrockets.com/uploads/1/3/1/6/131637136/3410352.pdf
    • http://files.mummydoctorlife.com/uploads/1/3/1/4/131453215/pedumaw-teziluxetubun-joxexada-kokalejujiwar.pdf
    • http://files.routonsofhenrycounty.com/uploads/1/3/0/8/130874300/bea7ac2dab448e.pdf
    • http://files.northernchainspecialties.com/uploads/1/3/1/4/131407796/71111330083d.pdf
    • https://cdn.shopify.com/s/files/1/0436/8682/2053/files/35522921596.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1362/files/after_effects_animation_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0431/6243/5739/files/foxudujun.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/8639430543.pdf
    • https://cdn.shopify.com/s/files/1/0436/4356/8278/files/lojezifumebarexudamo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9001/7430/files/design_architecture_in_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/anaphore_et_cataphore.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/35760413846.pdf
    • https://cdn.shopify.com/s/files/1/0435/2465/3224/files/32597002101.pdf
    • https://cdn.shopify.com/s/files/1/0434/8667/5108/files/let_s_dance_chris_rea_sheet_music.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d64.bin
3dc23a1db1d35a05445bb35a7166833ab4c596bf51292615fc221f19a68d15f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D64 5180 bytes
font_01_sfnt_off00006ed0.bin
b0adcbd7aca92c9d1fff57e5d3bbf63133926e89c59bab1c7b05003b4a8e0ff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED0 4516 bytes
font_02_sfnt_off00007b21.bin
12573ba68a2552d4d4ea180f3e959b60a24320439aa16429f87daab0d8039368		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B21 10404 bytes
font_03_sfnt_off00009ef8.bin
9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EF8 16036 bytes
font_04_sfnt_off0000b361.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB361 4324 bytes

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